* Rename `git-build' operation to `gbp-build' to make it clearer what
it's for. Keep the old name as an alias.
* Show `dgit sbuild' in usage message.
+ * When we are using dpkg-buildpackage to clean before using it to also
+ do the build, let it do its cleaning thing as part of its run, rather
+ than running it twice. When we are _not_ supposed to be using
+ dpkg-buildpackage to clean, but we are running it to do the build,
+ pass -nc.
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