[issue1504] Add 2to3 fixer for (un)bound methods

[Christian Heimes]

Christian Heimes added the comment:

Whatever you say. But shouldn't we make people to use types.MethodType()
or whatever we use as the new module for PyMethod_Type()? People are
going to use types.MethodType() when they see the deprecation warning.

By the way I've updated the docs in r59248.

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