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

[Brian Curtin]

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

This needs #7860 for properly figuring out the machine architecture for some 32-bit Python on 64-bit Windows tests.

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dependencies: +32-bit Python on 64-bit Windows reports incorrect architecture

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