* git-debrebase: convert-from-gbp: Use same algorithm for finding
upstream commitish as new-upstream. Closes:#905062.
* git-debrebase: Improve error messages for bad options.
+ * git-debrebase: Improve error message for convert-from-gbp
+ upstream discrepancy. Closes:#905078.
+ * git-debrebase(5): Add ILLEGAL OPERATIONS section. (Re#905004.)
+ * git-debrebase(1): Warn against plain git rebase. (Re#905004.)
+ * dgit-maint-debrebase(7): Warn more against plain git rebase.
+ Closes:#905004.
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