a4/a4 — pull request #194 by pwaller (2012-11-06 14:17:12+00:00)
Title: Move root2a4 back to a4root, and split it up into reusable pieces

We now don't have a dependency on a4atlas, at the expense of copying
a couple of proto files into `a4root/proto`.

Eventually all of the atlas-specific stuff can move out of a4root,
and we can have a specialised atlas-root2a4 living in a4atlas.