Bug fix candiadte.

Move imports to top

'94, demonstrating a thread bug that was later repaired via Python growing
an internal import lock.  It's of no current interest, and the now-std
test_threaded_import.py is pretty much the same test.

alphabetical order (!), and the obsolete 'extend' directory is no
longer mentioned.

This and the erasure of the extend directory are 2.2.1 bugfix
candidates (but only of you want to be thorough -- it's not like
anybody cares :-).

no longer exists.  Docs for distutils are plenty elsewhere.

Also changed <>-style #includes to ""-style in some places where the
former didn't make sense.

Expose Tix.ResizeHandle.{detach_widget,hide,show}.
Update Tix demos.

in the function table.  Add a docstring for the function as well, since
examples should show good form.

directives, which is the role of CPPFLAGS.  Closes SF patch #414991.

catch that instead of using a bare except clause.

catch that instead of using a bare except clause.

that's all that's needed.