* distro alias facility in config space. (Primarily for testing.)
* Undocumented --config-lookup-explode= feature. (For testing.)
* Provide `dgit print-dgit-repos-server-source-url'. Re:#850521.
+ * Honour dgit-distro.*.default-suite and dgit.default.default-suite.
dgit-badcommit-fixup:
* Do not investigate symrefs. Closes:#850547.