[issue6225] Fixing several minor bugs in Tkinter.Canvas and one in Misc._configure

[Éric Araujo]

Changes by Éric Araujo <merwok at netwok.org>:


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versions: +Python 3.3 -Python 3.1

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6225>
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