3 - build all archs of same package in one go
4 x strip all bundle support out
7 - deal with growing database: prune things.
8 - put build log into another table
9 - add table to mark which packages need xvfb-run; only use xvfb-run for those
10 (and only do those sequentially).
13 - split up dependency structure to support building under different distributions
14 - force'ing to a non-existent alias should fail.