[issue21076] Turn signal.SIG* constants into enums

[Giampaolo Rodola']

Giampaolo Rodola' added the comment:

New patch in attachment provides 3 enum containers and overrides all the necessary signal module APIs so that they interoperate with enums on both "get" and "set".
I decided *not* to rename signamodule.c to _signamodule.c in this patch so that it is easier to review (I will do the renaming as a second step).

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Added file: http://bugs.python.org/file34653/signals3.patch

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