2.22 [KK 2008-10-16]
- Implemented up/down state in back ends. Fixed up the docs.
- Rewrote msg() and debugmsg() handling: these are now macros that
  call _msg() and _debugmsg() depending on verbose/debug flags. The
  argument is a Mstr object, used to concatenate strings with ints,
  doubles and so on.