[issue7347] Add {Create|Delete}KeyEx to _winreg, doc and test updates

[Brian Curtin]

Brian Curtin <curtin at acm.org> added the comment:

Gabriel, besides the *Ex naming, do you see anything wrong with the rest of the patch? I'd like to try and get this into 2.7 before the upcoming beta.

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<http://bugs.python.org/issue7347>
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