So that's now passing
Sort out domain '' becomes None in labels
Various fiddlings

Including commenting some things out, and also changing the name
of db.just_pulled.get to be get_from_disk, to make it clearer that
it is replacing the previous (internal) value
Attempt at not always reloading build description
Add convenience method for middle of label name
Swap "muddle pull" default

Make the "new" mechanism the default, and give the old mechanism
the name "-noreload", which sort-of describes it. Explain it in
the help text.
Remove commented out debuging, part 1
I think this is a stable point
Still apparently working
At last, the refactoring I was aiming for.