* dgit sbuild no longer deletes extranious .changes files; instead
we rely on --rm-old-changes, or failing that, fail early.
* When doing quilt linearisation, treat upstream .gitignores not
* dgit sbuild no longer deletes extranious .changes files; instead
we rely on --rm-old-changes, or failing that, fail early.
* When doing quilt linearisation, treat upstream .gitignores not