Cleanup.
Stubs for new DB interface.
Initial acid-state db backend implementation.
It should be possible to remove groups entirely.
Microrefactoring.
C.B.DB -> C.B.Groups
Move "merging" algorithm to C.B.Execute.
Asking for all known groups should be possible.
Fix build.
Oops.
Cosmetics.
Print stuff for removal.
Cosmetics.
Merge branch 'feature-acid' into develop #55
Dependencies versions bounds.