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

[Christian Heimes]

Christian Heimes added the comment:

How should I issue a warning in the new module? Should and can I check
for the -3 warning option or should I warn w/o checks for the -3 option?

from warnings import warn as _warn
_warn("The 'new' module is not supported in 3.x",
    DeprecationWarning, 2)

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