[issue1717] Get rid of more refercenes to __cmp__

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

Do we also get rid of the tp_compare type slot? 6 types still use it, 
they should convert this to a tp_richcompare slot

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1717>
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