[win32] Probably bug: tracking permissions bits on windows

[Aaron Bentley]

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Martin Pool wrote:
| Yes; on Windows I think we would want to store the permissions in the
| working inventory and pay no attention to the permissions of the working
| copy files.

Because of this issue, and symlinks, I think we should have a
"WindowsWorkingTree", so we can separate that behavior out.

I don't know exactly what to do with symlinks.  It may make sense to
create a plaintext file on disk with the symlink target as its text. The
WindowsWorkingTree would cause it to appear to bzrlib as a symlink.
That would allow Windows users to manipulate the symlink target
directly, and provide a dummy file, making it harder to accidentally
reuse that filename.

Windows was the reason I wanted to represent the executable bit, because
I imagined a "bzr set-property" command that Windows users would be able
to use to set/unset the executable bit.

Aaron

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