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This patch refactors test_winreg.py to use unittest. When this patch is
applied, Lib/test/output/test_winreg can be removed.
I also made a few formatting changes to ensure that all lines are
constrained to 80-characters.
The original test_winreg.py took a command-line argument, "--remote", to
specify the name of a remote computer to run tests on. For now, I've
added a unittest test called "testRemoteMachineRegistryWorks" which
raises a test_support.TestSkipped exception if the "--remote" argument
wasn't specified. I'm not sure if this is optimal behavior; it can be
changed if not, of course.