[issue1717] Get rid of more references to __cmp__

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

Instead of tp_reserved, the name should be tp_deprecated_compare.

There should be a python-dev discussion around when to actually remove
the slot:

  3.0.1 -- binary incompatibility between minor releases (BAD)
  3.1.0 -- uncomfortable for writers who have to add #ifdefs
  4.0.0 -- no pain, just wasted space
  3.1.5 -- just plain mean :-)

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<http://bugs.python.org/issue1717>
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