[MERGE] (fixes #240910) Serve all filesystem roots on Windows

[Adrian Wilkins]

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Add a couple of special cases to urlutils._win32_path_(from|to)_url

This fixes the bug by allowing a LocalTransport with an empty string for
a base path to be created (only on Windows).

These now behave as you might expect on Windows.

bzr ls bzr://camelot/d:/branch  # where ``bzr serve --directory=/``
bzr ls bzr+ssh://robin@camelot/d:/repo/branch

Previously you were restricted to paths relative to the root of the
drive that Python.exe is on.

e.g.
bzr ls bzr+ssh://robin@camelot/repo/branch # only works if repo is on c:

It doesn't seem that you can access UNC paths over the server (but then
you couldn't do that anyway before the bug was fixed). If that's a
problem, you always have the workaround of mapping a drive letter, or
fixing it a bit more...

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