[issue1717] Get rid of more refercenes to __cmp__

[Mark Dickinson]

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

Still to do:

pybench needs updating to remove a cmp reference;  since the changes 
required for pybench are a little bit more substantial than simple cmp 
replacement, I've broken this out into a separate issue:  issue 4704.

There are many uses of cmp still in the Demos directory.  How much do we 
care?

The documentation in Doc/extending/newtypes.rst needs updating.  I can 
have a go at this, but Georg would almost certainly do a better job.

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dependencies: +Update pybench for python 3.0

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