Daily builds of audacity on Ubuntu

We have now a working daily build PPA for Audacity: https://launchpad.net/~audacity-team/+archive/daily

empty ubuntu-universe-sponsors queue

After acknowledging many sync requests (approximately 42), sponsoring a bunch of merges and bug fixes, the ubuntu-universe-sponsors queue is finally empty!

In contrast, the ubuntu-main-sponsors queue contains 89 items and the ubuntu-archive queue 177 items. We need more Ubuntu Core Developer working in the ubuntu-main-sponsors team.