Workaround for http://code.google.com/p/reviewboard/issues/detail?id=2236 (and duplicate http://code.google.com/p/reviewboard/issues/detail?id=1867).

Fix searches for directories that were renamed and adjust Index, +++, --- lines to use the *old* path to the file.  This is necessary because ReviewBoard checks the base paths for diffs.  In the case of a directory rename, modified files do not have a base path that exists (the base path only exists after *this* commit).

This workaround still displays the *old* path to the file in the ReviewBoard diff, though upon committing the renamed path will be used.  I couldn't find a way to resolve this.

Local changes being used internally at organization.