use EXISTS (SELECT 1.  when looking for un-suite'd binaries and source exclude stuff with an existent last_used.

* katie.py (source_exists): expand the list of distributionsthe source may exist in to include any suite that's mapped tothe destination suite (even transitively (a->b->c)). This shouldunbreak binary uploads to *-proposed-updates.

* katie.py (source_exists): add an extra parameter to limit thedistribution(s) the source must exist in.* kelly, lisa, jennifer: update to use the new source_exists

* ziyi: quick hack to support a FakeDI line in apt.conf to generatechecksums for debian-installer stuff even when it's just a symlink toanother suite* apt.conf: add the FakeDI line

add comment about Sources* filesfix naming of unstable's q-d output in fgrepdon't use said fgrep if the needed file doesn't exist

testing must be before unstable so packages uploaded after they've entered testingdon't end up building for testing, where it is likely to still fail.

add oldstable arch restriction and remove from q-d output any version thatis also in unstable's output.

Add --mode=[full|daily].  Dehardcode suite-ids.  pcmcia-cs is always dubious.  make nviu fail gracefully if there's no experiemntal.