[issue23591] enum: Add Flags and IntFlags

[Ethan Furman]

Ethan Furman added the comment:

Patch includes tests, but not docs.

>From a previous comment:
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> As it stands, Weird(7) would be <Weird.A|BC: 7>, and if A was not
> defined an error would be raised.

Actually, it would be <Weird.BC|A: 7> since BC has a higher value than A.

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stage:  -> patch review
Added file: http://bugs.python.org/file44278/issue23591.stoneleaf.02.patch

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