Desktop widget that indicates the main entrance door lock state at the
Chaos Computer Club in Hamburg.

A switch in the door frame at the CCC Hamburg registers locking / unlocking
events. The current state is exported to a webserver.

This widget shows an icon on the desktop indicating whether the door is
open or locked and optionally notifies the user on state changes.

Note to visitors: A locked door doesn't necessarily mean that nobody is
home. Often only the lower floors are populated. Join #ccchh on IRCnet.
