[Python-3000] pre-PEP: Procedure for PEPs with Backwards-Incompatible Changes

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    Steven> The (pre-)PEP should be mostly self-explanatory....

    Steven> PEP: XXX
    Steven> Title: Procedure for PEPs with Backwards-Incompatible Changes

Suggestion: Make this PEP 3001 and start any Py3k PEPs from 3100.  That
gives plenty of room between any PEPs that might be written for 2.x and
gives some space for various informational PEPs that are specific to Python
3.x.

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