* test suite: Set DEBFULLNAME
* git-debrebase: scrap works properly when it does only rebase --abort.
* dgit(1): Encourage --overwrite rather than --overwrite=version.
+ * 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.
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