[issue26988] Add AutoNumberedEnum to stdlib

[Ethan Furman]

Ethan Furman added the comment:

The problem with testing the type of object a name refers to outside the class is it then becomes more difficult to make that an Enum member:

class AddressType(Enum):
    pobox
    mailbox  # third-party po box
    property

Having to assign a value to `property` pretty much negates the value of the magic.

I'll go with `_ignore_`.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26988>
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