Packages Quality

Goal description

Improve the overall quality of all Debian packages.

Packages are built on the buildds, not all of the real build failures (which cannot be fixed by rebuilding in a clean (fixed) environment) are reported as RC bugs.
From time to time the whole archive is rebuilt.
Installability issues show up on debcheck (http://qa.debian.org/debcheck.php)
Upgrade and removal checks are done on piuparts (http://piuparts.debian.org)
From time to time double build is tried: building again after the previous build is finished.
Lintian errors (http://lintian.debian.org) are considered to be used to reject at package upload time