[issue2775] Implement PEP 3108

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

For the TextMate users, I am going to be checking in a Python-Dev bundle 
into svn soon which will include a command to insert the warnpy3k() call 
for module deletions. Might want to wait for that if you want to cut out 
at least one copy-and-paste step. =)

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