* Use dgit.debian.net vhost on alioth. Closes #720172.
* Usage message. Closes #720085.
+ * Provide "dgit sbuild".
* Assorted manpage fixes and improvements.
* Fail if a required config item is missing.
* Much better error messages.
* Better error checking when parsing RFC822-style control data.
+ * Better checking that the supplied .dsc and debian/changes correspond.
+ * Ordering improvement in push: don't add dsc field until git push done.
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