phases: track phase movements in 'advanceboundary'
Makes advanceboundary record the phase movement of affected revisions in
tr.changes['phases'].
The tracking is not usable yet because the 'retractboundary' function can also
affect phases.
We'll improve that in the coming changesets.
# name space package to host third party extensions
from __future__ import absolute_import
import pkgutil
__path__ = pkgutil.extend_path(__path__, __name__)