[Python-3000] Nix dict.copy()

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    Steven> Maybe copy.copy() could become __builtin__.copy()?  

And what of copy.depcopy()?  Doesn't seem to be much else public defined in
the copy module:

    % python -c 'import copy ; print copy.__all__'
    ['Error', 'copy', 'deepcopy']

If copy.copy() migrates to builtin it should raise something other than
copy.Error as well.

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