[issue1717] Get rid of more refercenes to __cmp__

[Christian Heimes]

Christian Heimes <lists at cheimes.de> added the comment:

Can you fix the decimal module and tests? You know more about the module
than me. I'm half through most of the others modules.

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