overlaychangectx: also assign repo to self._repo Without doing this, we get test failures due to core Mercurial methods (e.g. context.obsolete, context.orphan, etc) access self._repo. If we didn't go this route, we'd need to change core to (correctly) call self.repo() instead of _repo.

syntax: glob
*.pyc
tests/*.err
tests/.testtimes
build
dist
*.egg-info
*.orig