Merge Py Idle changes

Merge Py Idle changes
Rev 1.9
Improve handling of docstrings.  I had feared this was a case of
introspection incompatibility, but in fact it's just that calltips
always gave up on a docstring that started with a newline (but
didn't realize they were giving up <wink>).

Rev 1.10
(already merged)

Rev 1.11
(whitespace normalization, skip this time)

Rev 1.12
Remove unnecessary imports