Merge Py Idle changes:

Merge Py Idle changes:

Rev 1.35 fdrake
Use string.ascii_letters instead of string.letters (SF bug #226706).
Move computation of sets of characters out of the body of the function
that uses them.

Rev 1.36 tim_one
Convert a pile of obvious "yes/no" functions to return bool

Rev 1.37
(skip, done differently in Idlefork)

Rev 1.38 loewis
Patch #590913: PEP 263 support.

Rev 1.39 loewis
Convert characters from the locale's encoding on output.
Reject characters outside the locale's encoding on input.

Rev 1.40 doerwalter
(string methods)

Rev 1.41
(skipped, done by GvR in rpc)