** HYPERBOLE SYSTEM

  *** Installation: Hyperbole package installation options are greatly expanded.
      Stable or in-development branches may be installed with the Emacs package
      manager.  The Straight package manager may be used to keep up with
      git-based development and submit pull requests.  And stable and
      in-development tar balls are available for manual installation.  See
      "(hyperbole)Installation".

  *** Global Minor Mode: Hyperbole is now a global minor mode that can be
      toggled with {M-x hyperbole-mode RET}, meaning all of its key bindings
      can easily be enabled or disabled whenever desired.  Your init file needs
      to have (hyperbole-mode 1) in it instead of (require 'hyperbole) or
      Hyperbole will not be enabled upon startup.  See "(hyperbole)Usage".

      Modeline Indicator: In the modeline where minor modes are shown,
      "Hypb" now appears whenever Hyperbole is active.

      Hooks: When hyperbole-mode is enabled, hyperbole-mode-hook and
      hyperbole-mode-on-hook are run.  When hyperbole-mode is disabled,
      hyperbole-mode-hook and hyperbole-mode-off-hook are run.

      Lexical Binding: All code is now largely lexically bound, improving
      quality and debugability.


** ORG MODE

  *** M-RET: Reworked M-RET interface so can control how much or little of
      Hyperbole works in Org mode when Hyperbole minor mode is enabled.
      See "(hyperbole)enable org-mode support" and "hsys-org.el".

  *** hsys-org-enable-smart-keys: New customization to replace
      'inhibit-hsys-org'.  This applies only in Org major/minor modes when
      hyperbole-mode is active.  t means enable Smart Key support
      everywhere.  The symbol, buttons, is the default; it means the Smart
      Keys are active only when point is within a Hyperbole button.  A nil
      value means no Smart Key support so {M-RET} behaves just as it does
      normally in Org mode.  See "(hyperbole)Org-mode".  Use {C-h h c o}
      to customize this setting.

      This table summarizes the operation:

      |--------------+-------------------+------------------+----------+------------------|
      | Set To       | Smart Key Context | Hyperbole Button | Org Link | Fallback Command |
      |--------------+-------------------+------------------+----------+------------------|
      | buttons      | Ignore            | Activate         | Activate | org-meta-return  |
      | nil          | Ignore            | Ignore           | Ignore   | org-meta-return  |
      | t            | Activate          | Activate         | Activate | None             |
      |--------------+-------------------+------------------+----------+------------------|


** EASILY CREATE YOUR OWN BUTTON TYPES

  *** Simple Action Link Button Type Creation: `defal' is a new,
      easy-to-use construct that generates new action button types from
      a type name and a single simple format expression, allowing
      non-programmers to create their own implicit action button link
      types that execute key series, display URLs, display the contents
      of pathnames or invoke functions.  See "(hyperbole)Action Button
      Link Types" or the "DEMO2#Defining New Action Button Types"
      section.

  *** Easy Implicit Link Button Type Creation: 'defil' is a new
      construct for those familiar with regular expressions but not
      much Emacs Lisp.  This creates more flexible implicit button
      types than 'defal' where the delimiters and text substitution
      can be specified with regular expressions.  Actions are limited
      to executing key series, displaying URLs, displaying the
      contents of pathnames or invoking functions.  See
      "(hyperbole)Implicit Button Link Types".

      Elisp programmers should use the existing 'defib' macro for full
      flexibility in implicit button type creation.  See "hibtypes.el"
      for examples and "(hyperbole)Programmatic Implicit Button Types"
      for documentation.


** TEST CASES

  *** Hyperbole Automated Testing: Extensive quality improvements throughout
      Hyperbole thanks in part to over 230 test cases now included in the
      test/ subdirectory.  Simply run 'make test-all' or 'make test' from the
      command-line when in the Hyperbole source directory and you should see
      all tests pass.  If any fail, you can press the Action Key to see the
      source of the failure.  Full testing is supported under POSIX systems
      only.  See "Makefile" and "test/MANIFEST".
 
  *** Implicit Button Types to Run Tests: The file "hypb-ert.el" contains two
      action link types:
        hyperbole-run-test  - run a single Hyperbole test by name
        hyperbole-run-tests - run one more tests matching a pattern
      
        Example uses:
          Run the test hbut-defal-url
            <hyperbole-run-test hbut-defal-url>

          Run the tests specified by the test selector hbut-defal
            <hyperbole-run-tests hbut-defal>

          Run all tests
            <hyperbole-run-tests t>
 
  *** Installation Testing: install-test/local-install-test.sh automatically
      installs Hyperbole for testing from one or more of its releases or
      development branches.  See "Makefile" and "install-test/MANIFEST".


** HYROLO  (See "(hyperbole)HyRolo").

  *** Faster searching within HyRolo match buffer: After performing a HyRolo
      search with point in the match buffer, if you want different results,
      you can quickly do a new regular expression HyRolo search with {r} or
      a string/logical search with {C-u r}.  This key had moved to previous
      matches but that is already bound to {Shift-TAB} and {M-TAB}.

  *** Auto-Expansion of Entries: If an entry is collapsed/hidden, moving to
      any hidden part auto-expands it and then re-collapses it when point is
      moved to another entry (just like isearch).  A side-effect of this is
      that the {h} hide entry subtree command now moves to the beginning of
      the entry.

  *** hyrolo-find-file: New command that selects and edits a file in
      'hyrolo-file-list', defaulting to the first listed file when not given
      a prefix arg.  Available in the minibuffer menu as Rolo/File and the
      pulldown menu as Rolo/Find-HyRolo-File.

  *** Sorting Entries Rewritten:  {C-h h r o} re-ordering HyRolo entries has
      been rewritten for compatibility and improved debugging with the latest
      Emacs releases.

  *** hyrolo-highlight-face: Now uses the Emacs 'match' face by default.

  *** Under MS Windows, the default HyRolo file is now "~/.rolo.otl" like
      all other operating systems, instead of "~/_rolo.otl".  Any older file
      name will be relocated to the newer name.


** KOUTLINER  (See "(hyperbole)Koutliner").

  *** Export Koutlines to Collapsible Web Pages: {C-h h k f d} or
      {M-x kexport:display RET} command creates and displays a web-based
      expandable/collapsible outline from the Koutline in the current buffer.
      See "(hyperbole)Exporting" and the new Koutliner Format submenu.

  *** Org File Importation: Org files may now be imported to a Koutline using
      {M-x kimport:file RET}.

  *** Org Table Support: Org table editing now automatically works in the
      Koutliner via Org table minor mode.  Use {M-x orgtbl-mode RET} to
      toggle this on and off.  A press of the Action Key on a | symbol,
      also toggles this minor mode on or off. See "(Org)Tables" for details.
      Use a prefix arg with {TAB} to promote/demote Koutline trees when in
      a table since {TAB} moves between fields within a table.

  *** New Tree Movement Commands: Like Org mode, {[M-down]} and {[M-up]} move
      the current tree past or before other trees at the same level.  With a
      prefix argument, move past that many trees.

  *** New Tree Promotion/Demotion Keys: Tree promotion and demotion keys now
      match many of the defaults in Org mode and Outline mode, plus some
      easier to type ones.  The tables below summarize which keys work whether
      inside an Org table or outside.  See "(hyperbole)Promoting and Demoting".

      |----------------------------+-----------------------------|
      | Promotion Inside Org Table | Demotion Inside Org Table   |
      |----------------------------+-----------------------------|
      | M-0 Shift-TAB or M-0 M-TAB | M-0 TAB                     |
      | C-c C-,                    | C-c C-.                     |
      | C-c C-<                    | C-c C->                     |
      |----------------------------+-----------------------------|

      |-----------------------------+----------------------------|
      | Promotion Outside Org Table | Demotion Outside Org Table |
      |-----------------------------+----------------------------|
      | Shift-TAB or M-TAB          | TAB                        |
      | M-left                      | M-right                    |
      | C-c C-,                     | C-c C-.                    |
      | C-c C-<                     | C-c C->                    |
      |-----------------------------+----------------------------|

  *** New Mail Tree Key Binding: The 'kotl-mode:mail-tree' command that
      extracts the current view of a Koutline in text-only format and
      creates an outgoing email message with it, has moved from {C-c @}
      to {C-c C-@} to prevent conflict with the global hycontrol-window-grid
      command bound to {C-c @}.

  *** New Copy Command: The new command, 'kotl-mode:copy-tree-or-region-to-buffer',
      bound to {C-c M-c} copies a Koutline tree or the active region
      to a specified buffer.  Prompts dictate whether invisible text
      is included or not.  This allows copying parts of Koutlines
      directly into other buffers without having to copy to a
...

- Global Org Link Activation: The Action Key now activates Org links in
  non-Org buffers if 'inhibit-hsys-org' is nil (the default).  The Assist
  Key shows help.

- Org Agenda Item Display: The Action Key displays the Org node
  associated with Agenda items such as TODOs in another window.  The
  Assist Key shows help.

- Org Mode: Raised to near top priority in implicit button types so that
  pathnames, URLs, etc. within Org links are handled by Org rather than
  Hyperbole.

- Smart Dired Sidebar: Smart Key support for the dired-sidebar
  package.  See "(hyperbole)Smart Key - Dired Sidebar Mode".

- Helm Mode:  The Smart Keys do all sorts of things in helm completion buffers
  and the associated minibuffer.  See "(hyperbole)Smart Key - Helm Mode".

- Magit Mode: Action Key expands/collapses like {TAB} and Assist Key
  jumps to items like {RET}.  See "(hyperbole)Smart Key - Magit Mode".

- {Key Series} Button Support for Helm and Counsel: Key series buttons
  with M-x commands now work properly when counsel-mode or helm-mode are
  enabled and M-x is rebound.

- Markdown In-file Links: With point on the link title, in-file links are
  now activated properly (previously point had to be on the link itself).

- Git#directory Buttons: New flag, hibtypes-git-use-magit-flag, which if
  set to t and Magit is available, then when activating a git directory
  button, such as git#/hyperbole, use Magit rather than Dired.

- Explicit Buttons Work Immediately: Previously you had to save the buffer
  in which you created an explicit button before it would work.  Now they
  work immediately after creation.

- Helm Mode: Added Hyperbole Manual section, "Smart Key - Helm Mode"
  that works on helm completions.  See "(hyperbole)Smart Key -
  Helm Mode".

- Hyperbole Slides: Slides used in a talk by the author on the history
  and capabilities of Hyperbole, see "HY-TALK/HY-TALK.org".

- Magit Mode: Added Hyperbole Manual section, "Smart Key - Magit Mode"
  that expands/collapses/jumps to Magit items.  See "(hyperbole)Smart Key -
  Magit Mode".

- In-buffer Labels: Fixed a number of in-buffer text handling issues with
  the creation of explicit buttons, maximizing reuse of existing text in
  labels.

- link-to-file Action Type: Extended to allow file path to include either
  :line-num:column-num or just :line-num at the end (translated to character
  location within the button).

- Bookmark Mode: Added Hyperbole Manual section, "Smart Key - Bookmark Mode"
  that allows linking to Emacs Bookmarks.  See "(hyperbole)Smart Key -
  Bookmark Mode".

- Activate Any Labeled Buffer Button: Hyperbole's top-level menu 'Act'
  command either activates any button at point or prompts for the choice of
  any labeled explicit or implicit button within the buffer to activate.
  The pulldown menu item, Activate-Button-in-Buffer, behaves the same.

- Org-mode in Q&A Appendix: Rewrote this section to account for improved
  integration.

- After installing the ace-window package and loading Hyperbole, execute
  (hkey-ace-window-setup "\M-o") to enable the following capabilities:

- Region Throws: The hkey-throw command bound to {M-o t} now throws the
  active (highlighted) region, if any, into the target window's buffer,
  rather than replacing its buffer with the source window buffer.  If
  you don't use region highlighting, i.e. transient-mark-mode, then use
  {C-u M-o t} for the same effect.  The buffer in the target window
  must differ from the one in the source window.  With no region
  active, this command still throws the source buffer to the target
  window.  See "DEMO#Displaying File and Buffer Items and Moving Buffers".

- Modeline Drag Window Resizing: Smart Key window resizing now provides
  live feedback during the drag.

- Bottommost Modeline Frame Moving: After adding a 'drag-with-mode-line'
  frame parameter with a value of t, a drag of any of its bottommost
  modelines with either Smart Mouse Key repositions the frame on screen.
  See "(hyperbole)Moving Frames" for information on how to configure this
  feature.

- hproperty:flash-face: Face used when flashing a button; now customizable.

- hproperty:highlight-face: Face used to highlight a line; now customizable.

- inhibit-hsys-org: See ORG MODE section below.

- Hlink Definitions: Added Action Button, Elink, Ilink, Glink definitions.

- Buffer/Window Swapping: Improved {~} so current buffer remains the same but
  the selected window changes.  Also made frame buffer swapping work anytime
  there are two or more frames regardless of how many windows in each.  See
  "DEMO#Swapping Buffers".

- Hyrolo Add: Fixed new entry addition to add in sorted order and make logic
  operators perform properly, after a bug in level calculation had been
  introduced.

- Double Quoting Key Series: Key series delimited by {} may now be in double
  quotes, e.g. "{C-x o}".

- Windows to Posix Paths: Much improved conversion of MSWindows UNC paths to
  existing Posix mount points when running Emacs under Windows Subsystem for
  Linux.  See

- Flashing Implicit Buttons: More types of implicit buttons now flash when
  activated.

- Improved Grep Output Parsing: Recognizes file names with spaces followed by
  the null (^@, ASCII 0) character.

- Texinfo @-Quoted Path Variables: Hyperbole now can resolve paths as
  complicated as this: @file{$@{hyperb:dir@}/DEMO#POSIX and MSWindows Paths}
  in Texinfo files if the Action Key is pressed on the / or after, i.e. after
  the variable name.

- Deleted C-c C-r Global Binding: Removed {C-c C-r} key binding for explicit
  button renaming due to conflicts with some major modes

- Implicit Button Support: Org-mode's local binding of {M-RET} by default
  now activates Hyperbole implicit buttons when within them.

- inhibit-hsys-org: New customization that when set non-nil disables
  all Smart Key support in any Org major or minor mode.

- hsys-org-hbut-activate-p: Added to org-metareturn-hook so local binding
  of {M-RET} in org-mode activates Hyperbole buttons when point is over
  them. (It doesn't run the full set of Action Key actions).

- Auto Imenu Reindexing: If using Emacs imenu package, the Action Key
  will look up in-buffer identifier references with imenu.  If imenu's
  index is rendered invalid due to large changes in a buffer, Hyperbole
  will now automatically rebuild the index to have correct pointers.
  (Does not require use of the imenu-auto-rescan setting.

- hypb:mark-object: Gives Hyperbole-specific strings and symbols
  a hyperbole property that distinguishes them from other objects.

- hypb:object-p: Tests whether has the hyperbole property.  This is useful
  in hpath:relative-to and hpath:absolute-to where any string with a
  hyperbole property is ignored as a potential path.  For example, this
  prevents removal of trailing whitespace from normalized key series.

- hbut:act: Hyperbole button parameter is now optional and defaults to
  the located button, the symbol, 'hbut:current.

- ibtypes tag lookup: Implicit button type names such as ibtypes::grep-msg
  are now properly found in tags tables using their defib names
  (e.g. grep-msg).

- hmouse-drag-p: tests whether absolute Smart Mouse Key depress and
  release positions differ (relative to display/screen coordinates).

- hycontrol-quit: Unified the two Hycontrol mode quit commands into this one.
  hycontrol-abort: Renamed from hycontrol-abort-mode.

- hyperb:autoloads-exist-p
  hyperb:maybe-generate-autoloads
  hyperb:generate-autoloads: Added and called from hyperb:init when
  initializing Hyperbole to generate auto-autoload files when
  running from a non-packaged source download of Hyperbole.

- Action Buttons: A new, universal syntax for creating implicit buttons
  that execute any existing action types or Elisp functions.  Such
  buttons are delimited by angle brackets, < >, and come in three types:
  action type invocations, function calls and variable displays.  See
  "(hyperbole)Action Buttons" for examples and details on this exciting
  new capability.

- Labeled Implicit Buttons: Optional <[labels]> that precede implicit
  buttons.  This enables implicit buttons to be activated by name when
  in the current buffer or anywhere when added to the global buttons
  file (personal button file).

- Link to Buttons: New implicit button types that link to buttons based
   on their categories and labels:

    In Buffer Syntax                                       Implicit Button Type
    ===========================================================================
    <elink: explicit button label to link to: optional ebut file>  link-to-ebut
    <glink: global button label to link to>                        link-to-gbut
    <ilink: implicit button label to link to: optional ibut file>  link-to-ibut

- Other New Implicit Button Types:
    debugger-source: Jump to the source of errors from the Python pytype package
    ipython-stack-frame: Jump to the source of ipython stack traces and exceptions

- Other New Action Types:
    link-to-bookmark: Display an Emacs bookmark

- Much Faster Implicit Buttons: Major speedup in implicit button identification
  and activation even with the new generalized Action implicit button type
  syntax, due to internal optimizations.

- Pathname Flashing: Pathname implicit buttons now flash when activated.

- Pathname References: Pathname implicit buttons may contain both link anchors
  and line and column numbers.  Format is:
    "<path>[#<link-anchor>]:<line-num>[:<col-num>]"

- Shell Script Link Anchors: Link anchors now work for shell script editing modes
  as well using comment lines as the anchors, e.g. "myscript.sh#Env Variables".

- Dir Variable Separators: Variables in paths no longer require a trailing directory
  separator.  Both of these are live Hyperbole paths:
  "${hyperb:dir}DEMO#Smart Mouse Keys"
  "${hyperb:dir}/DEMO#Smart Mouse Keys"

- Jump Thing: Added xml-mode support for pressing the Action Key when on a start or
  end tag pair to select the whole region between them.  {C-c .} also moves between
  the start and matching end tag.  See "(hyperbole)Smart Key Thing Selection".

- DEMO: New sections on Button Files and Global Buttons.

- Action Types: link-to-gbut, link-to-ibut - Added.

- hpath:native-image-suffixes: documented this setting for controlling
  image types that Hyperbole displays within Emacs.

- Implicit Button Types: Split off type descriptions to this new
  subsection and added these types: ripgrep-msg, ipython-stack-frame,
  ilink (link to implicit button), glink (link to global button), and
  elink (link to explicit button).

- DEMO (Action Buttons): Added description and examples.

- Path Variables: Better documented how these are handled.

- Hyperbole Manual, DEMO (Implicit Buttons): Added description and
  example of implicit button labels.

- Glossary: Updated Implicit Button and Global Button entries with
  changes.

- When 'c' (clip to lines per cell) is omitted from a viewspec, clipping
  now changes to whatever the default number of lines per cell is
  (typically, unlimited).  The same goes for the 'l' spec (limit display
  to a certain level of cells).

- Pulldown Menus:   Implicit-Button/Label: Added to add a label.
                    Implicit-Button/Rename - Added to rename the label
                    of an implicit button.

- Minibuffer Menus: hui-mini.el (hui:menus): Added Ibut/Label and
  Ibut/Rename.

- Radio Targets and Links: Smart Keys now handle these.

- Links: Smart Keys handle both internal and external Org mode links.

- ibut:at-type-p: Added to test if point is on a specific type of
  implicit button.

- hbut:key, ebut:key, ibut:key, hbut:rename, hui:hbut-rename,
  hui:hbut-operate: Added to allow renaming of any type of labeled
  Hyperbole button.

- hypb:region-with-text-property-value: Added and used in hysy-org.el.

- hsys-org-mode-function, hsys-org-mode-p: Added to determine when
  hsys-org actions are activated.

- ebut:key-src-set-buffer, hbut:key-src-set-buffer, hbut:key-list,
  hbut:ebut-key-list, hbut:ibut-key-list, hbut:label-list): Added
  to allow selection of labeled Hyperbole buttons in currrent buffer by
  name.

- gbut:get, hbut:map, ibut:label-map, ibut:key-src, ibut:key-to-label,
  ibut:label-to-key, hui:ebut-act, ibut:summarize, ibut:label-start,
  ibut:label-end, ibut:label-p, ibut:get, hui:ibut-label-create,
  hui:ibut-rename, hui:ibut-message, ibut:alist, ibut:list, ibut:map,
  ibut:next-occurrence, ibut:label-regexp, gbut:ibut-key-list, ebut:to,
  gbut:to, ibut:to, ibut:label-separator, hbut:label-regexp,
  ibut:rename, hbut:get: Added to support implicit button labels and
  links to buttons.
  hbut:label-p: Updated to handle implicit button labels.
  ibut:label-separator-regexp, hbut:outside-comment-p: Added.

- elink, elink:start, elink:end: Added for in-buffer links to explicit buttons.
  glink, glink:start, glink:end: Added for in-buffer links to global buttons.
  ilink, ilink:start, ilink:end: Added for in-buffer links to implicit buttons.

- hsys-org-set-ibut-label: Added and used in org-mode ibtype.
  org-mode, hsys-org-at-block-start-p: Added Action Key activation of
  Org blocks when on 1st line of def.

- Emacs Bookmark Menu Mode: Jump to the bookmark at point.

- hpath:find-program: Changed to prioritize hpath:native-image-suffixes
  over hpath:internal-display-alist over hpath:external-display-alist-macos
  instead of the reverse.  This prevents external viewers from being
  used when internal viewers are also in effect.

- Action Buttons: A new, universal syntax for creating implicit buttons
  that execute any existing action types or Elisp functions.  Such
  buttons are delimited by angle brackets, < >, and come in three types:
  action type invocations, function calls and variable displays.  See
  "(hyperbole)Action Buttons" for examples and details on this exciting
  new capability.

- Labeled Implicit Buttons: Optional <[labels]> that precede implicit
  buttons.  This enables implicit buttons to be activated by name when
  in the current buffer or anywhere when added to the global buttons
  file (personal button file).

- Link to Buttons: New implicit button types that link to buttons based
   on their categories and labels:

    In Buffer Syntax                                       Implicit Button Type
    ========================================================================
    <elink: explicit button label to link to: optional ebut file>  link-to-ebut
    <glink: global button label to link to>                        link-to-gbut
    <ilink: implicit button label to link to: optional ibut file>  link-to-ibut

- Other New Implicit Button Types:
    debugger-source: Jump to the source of errors from the Python pytype package
    ipython-stack-frame: Jump to the source of ipython stack traces and exceptions

- Much Faster Implicit Buttons: Major speedup in implicit button identification
  and activation even with the new generalized Action implicit button type
  syntax, due to internal optimizations.

- Pathname Flashing: Pathname implicit buttons now flash when activated.

- Pathname References: Pathname implicit buttons may contain both link anchors
  and line and column numbers.  Format is:
    "<path>[#<link-anchor>]:<line-num>[:<col-num>]"

- Shell Script Link Anchors: Link anchors now work for shell script editing modes
  as well using comment lines as the anchors, e.g. "myscript.sh#Env Variables".

- Dir Variable Separators: Variables in paths no longer require a trailing directory
  separator.  Both of these are live Hyperbole paths:
  "${hyperb:dir}DEMO#Smart Mouse Keys"
  "${hyperb:dir}/DEMO#Smart Mouse Keys"

- DEMO: New sections on Button Files and Global Buttons.

- Action Types: link-to-gbut, link-to-ibut - Added.

- hpath:native-image-suffixes: documented this setting for controlling
  image types that Hyperbole displays within Emacs.

- Implicit Button Types: Split off type descriptions to this new
  subsection and added these types: ripgrep-msg, ipython-stack-frame,
  ilink (link to implicit button), glink (link to global button), and
  elink (link to explicit button).

- DEMO (Action Buttons): Added description and examples.

- Hyperbole Manual, DEMO (Implicit Buttons): Added description and
  example of implicit button labels.

- Glossary: Updated Implicit Button and Global Button entries with
  changes.

- When 'c' (clip to lines per cell) is omitted from a viewspec, clipping
  now changes to whatever the default number of lines per cell is
  (typically, unlimited).  The same goes for the 'l' spec (limit display
  to a certain level of cells).

- Pulldown Menus:   Implicit-Button/Label: Added to add a label.
                    Implicit-Button/Rename - Added to rename the label
                    of an implicit button.

- Minibuffer Menus: hui-mini.el (hui:menus): Added Ibut/Label and
  Ibut/Rename.

- Radio Targets and Links: Smart Keys now handle these.

- Links: Smart Keys handle both internal and external Org mode links.

- ibut:at-type-p: Added to test if point is on a specific type of
  implicit button.

- hypb:region-with-text-property-value: Added and used in hysy-org.el.

- hsys-org-mode-function, hsys-org-mode-p: Added to determine when
  hsys-org actions are activated.

- ebut:key-src-set-buffer, hbut:key-src-set-buffer, hbut:key-list,
  hbut:ebut-key-list, hbut:ibut-key-list, hbut:label-list): Added
  to allow selection of labeled Hyperbole buttons in currrent buffer by
  name.

- gbut:get, hbut:map, ibut:label-map, ibut:key-src, ibut:key-to-label,
  ibut:label-to-key, hui:ebut-act, ibut:summarize, ibut:label-start,
  ibut:label-end, ibut:label-p, ibut:get, hui:ibut-label-create,
  hui:ibut-rename, hui:ibut-message, ibut:alist, ibut:list, ibut:map,
  ibut:next-occurrence, ibut:label-regexp, gbut:ibut-key-list, ebut:to,
  gbut:to, ibut:to, ibut:label-separator, hbut:label-regexp,
  ibut:rename, hbut:get: Added to support implicit button labels and
  links to buttons.
  hbut:label-p: Updated to handle implicit button labels.
  ibut:label-separator-regexp, hbut:outside-comment-p: Added.

- elink, elink:start, elink:end: Added for in-buffer links to explicit buttons.
  glink, glink:start, glink:end: Added for in-buffer links to global buttons.
  ilink, ilink:start, ilink:end: Added for in-buffer links to implicit buttons.

- hsys-org-set-ibut-label: Added and used in org-mode ibtype.
  org-mode, hsys-org-at-block-start-p: Added Action Key activation of
  Org blocks when on 1st line of def.

- hpath:find-program: Changed to prioritize hpath:native-image-suffixes
  over hpath:internal-display-alist over hpath:external-display-alist-macos
  instead of the reverse.  This prevents external viewers from being
  used when internal viewers are also in effect.