If I understand correctly, in python3 it is no longer necessary to 
implement __ne__, if it is simply the negation of __eq__.

There are currently about 200 definitions of the form

    def __ne__(self, other):
        return not (self == other)

I think it would be good to remove them.  Travis and I are currently 
discussing a case where it makes sense to have a different implementation 
of __ne__.  If the sage codebase has only those __ne__ which are really 
necessary, it would make intentions clearer.

Opinions? (otherwise I would create a pull request)

Martin

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