These should no longer be necessary since we changed the algorithm to
determine parents.
The code supporting parent overrides remains for now, for less
disruption to the code base as we near 1.0 and in case this change needs
to be reverted. If successful then the supporting code can be removed at
some point subsequent to the 1.0 release.
These should no longer be necessary due to Launchpad having been fixed
(LP #1881598 and others).
The code supporting pull overrides remains for now, for less disruption
to the code base as we near 1.0 and in case this change needs to be
reverted. If successful then the supporting code can be removed at some
point subsequent to the 1.0 release.