clearing old ARB submissions

[Allison Randal]

As suggested in:

https://bugs.launchpad.net/bugs/1079937

It's probably about time to do a queue flush on old submissions. In the
past we did this by release: since the ARB only approves apps for the
current release (quantal), we drop all submissions entered for precise
and earlier releases. The apologetic comment to the app author will
invite them to resubmit after they test that their app works properly on
quantal.

If the ARB members decide this is an appropriate action to take at this
time, I volunteer to help with the effort of drafting a friendly note
for app authors, and with closing out old submissions.

Allison