[PATCH] win32 ScratchBranch must close lockfile before deleting

[John A Meinel]

On windows, a file cannot be deleted if it is already open. Since
Branch() holds the lockfile open ScratchBranch() has to close it before
shutil.rmtree will work.

Attached is a patch that just closes self._lockfile() before deleting.
This makes all self-tests pass.

All of the tests still don't pass, since .bzrignore is still being
read/written in the wrong format (binary versus non-binary).

This is a patch against bzr 611.

John
=:->

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