The major changes:
- No more hit and hit-* packages
- No more diagram and SVG font stuff
- Dependency on darcs is not yet removed
- No more persistent-graph i.e. recursive SQL queries
- Some hit-network stuff still in use, now part of Vervis itself
- Git operations use the git command-line program, a convenient API is provided
in Data.Git.Local
- No more patch parsing and no diff view, patches are treated as a piece of
text and displayed as-is (although I could add syntax-highlighting as a nice
touch for the HTML view)
The actor key will be used for all actors on the server. It's held in a `TVar`
so that it can always be safely updated and safely retrieved (technically there
is a single writer so IORef and MVar could work, but they require extra care
while TVar is by design suited for this sort of thing).
