[issue1717] Get rid of more references to __cmp__

[Mark Dickinson]

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

Thanks, Guilherme.

> For this reason I would actually prefer to them not be comparable.

That's fine with me, so long as we can be sure that there's no existing 
code that depends on them being comparable.  I can't figure out whether 
there's any legitimate way that the tp_compare slot (which is currently 
implemented) of a PyTclObject could ever be called.

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