[issue22053] turtledemo: clean up start and stop, fix warning

[Terry J. Reedy]

Terry J. Reedy added the comment:

After backporting 004fe3449193 (#10921 3.5 patch) with changes as 7708f80940b0, forward port to 3.5 the 3.4 patch c26862955342 that did not merge before.  The 3.4 and 3.5 files are identical.

Misdirected changeset notices:

New changeset 4349bbc21ca7 by Terry Jan Reedy in branch 'default':
Issue #22065: forward port the changes in c26862955342, update docstring with
http://hg.python.org/cpython/rev/4349bbc21ca7

New changeset 59cc3bfdac4b by Terry Jan Reedy in branch 'default':
Issue #22065: Try the delete demohelp.txt part again.
http://hg.python.org/cpython/rev/59cc3bfdac4b

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