* test suite: unset GIT_EDITOR, so it works if user has that set.
* git-debrebase: Improve laundry performance by a factor of ~55:1,
and analysis performance by factor of ~4.2:1. Closes:#905995.
+ * git-debrebase: `prepush' is now a silent no-op if the branch is
+ unstitched. This is more friendly.
+ * git-debrebase: On rebase, always save ffq-prev even if we were
+ both stitched and laundered. Closes:#905975.
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