graft: show more useful status information while grafting Show status messages with first line of commit description and names, like grafting 12:2647734878ef "fork" (tip) This gives more context for the user when resolving conflicts.

tests: test coverage for empty graft A future change will add a warning to the quiet rebase.

largefiles: drop the unfiltered repo usage in overridepurge() Now that repoview supports replacing methods, we don't need this hack.