Implement Outstanding Operations management#99

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Lynesth wants to merge 7 commits intopython-smpplib:masterfrom

Lynesth:patch-10

Commits on Sep 7, 2019

Commits on Sep 12, 2019

Commits on Sep 23, 2019

Merge branch 'master' into patch-10
Lynesth
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Commits on Oct 5, 2019

Use a set to keep track of outstanding operations
Lynesth
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