[issue3405] Add support for the new data option supported by event generate (Tk 8.5)

[R. David Murray]

Changes by R. David Murray <rdmurray at bitdance.com>:


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stage:  -> patch review
type:  -> feature request
versions: +Python 3.3 -Python 2.6, Python 3.0

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<http://bugs.python.org/issue3405>
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