BugServer (required): is used by 'dak process-unchecked' and 'dak rm'
when closing bugs.
-PackagesServer (requried): used by 'dak rm' when carbon-copying a bug
-close mail to a package maintainer.
+PackagesServer (required): used by 'dak rm' and 'dak override' when
+carbon-copying a bug close mail to a package maintainer.
TrackingServer (optional): used by 'dak process-unchecked' and 'dak
rm' to send messages for the maintainer also to an alias for people