[issue20635] Fix the grid geometry manager and add tests for geometry managers

[Ned Deily]

Ned Deily added the comment:

test_tk with test_geometry_managers_2-2.7.patch applied passed on OS X 10.9 linked with Carbon Tk 8.4.20, Cocoa 8.5.15, Cocoa 8.6.1, and X11 8.6.1.

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<http://bugs.python.org/issue20635>
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