[issue1578269] Add os.symlink() and os.path.islink() support for Windows

[Jason R. Coombs]

Jason R. Coombs <jaraco at jaraco.com> added the comment:

With patch 29, I believe all patch-related test failures are corrected.

The remaining failures in some modules (namely test_tarfile, test_glob, test_mailbox, test_warnings) can be demonstrated to occur in unpatched builds. Since some failures are transient, I created repeat_test, which I used to demonstrate that test_glob, test_tarfile, and test_mailbox will fail on a clean build.

Additionally, I'm including test output for 32- and 64-bit builds on the unpatched build, the patched build running under administrator, and the patched build running under guest.

The test output was generated in an automated fashion to guarantee a clean build. The build process can be found by easy_installing jaraco.develop==1.1.1 and running test-python-symlink-patch.py (VS9, GNU patch, and svn required).

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Added file: http://bugs.python.org/file16832/repeat_test.py

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