PTS bit of the day: show testing transitions

Tiny teeny PTS bit of the day: the PTS now provides information about testing transitions.

If your package is part of an ongoing transition its uploads to unstable will be blocked by DAK. The PTS informs you about that and points to extra information and upload alternatives.

At the time of writing a couple of examples are: aubio and dballe. Though now that we have such powerful tools, Debian will be so fast at completing the python2.5 transition that you won't have time to see the new PTS messages