Distributed bug tracking

The bug trackers are all in different languages, and we have been working with contractors who
are upstream on them to have a reasonably standardised network service API to talk to them.
Other folks will of course be able to use that too, which is great.

In Launchpad, the status in each place a bug is tracked is separate. So Debian can consider a
bug "medium" while Ubuntu can consider it "important". We try to map all the different kinds
of status in different bug trackers to something sensible in Launchpad.