Derive version from git describe
Deployment script and other related changes

local.conf has (again) moved to the root directory.  Sorry.
Merge branch 'master' of github:databrary/play
Make ffmpeg usage single-threaded
Add ContainerAsset.remove
Missed some local.conf references
Refactor measure interface into typed and untyped

The untyped interface more closely aligns with its current usage and
allows the database to deal with types.
Eliminate annotation meta-type

Comments and records are handled differently enough that the abstraction
was just adding confusion.

Yes, I said I would start using real evolutions, but I'm lazy, and the
demo production site isn't up yet anyway.

I'm not perfectly happy with the way comments are now, but they're
incomplete in other ways, anyway.
Make Commented more useful for posting at least
Merge remote-tracking branch 'remotes/origin/master' into gui
better form error handling.