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

[Jason R. Coombs]

Changes by Jason R. Coombs <jaraco at jaraco.com>:


Removed file: http://bugs.python.org/file16003/windows symlink draft 20.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1578269>
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