[issue1717] Get rid of more references to __cmp__

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

I'm not going to get more time to work on this before
the weekend, so if anyone else wants to take over please
feel free.

Still to do for stage 2:  cell objects and slot
wrapper objects need to have tp_richcompare
implemented, to replace the tp_compare slots that
are being removed.

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