Set up 'zapped rooms' functionality. Made tweaks so that zapped rooms

Set up 'zapped rooms' functionality.  Made tweaks so that zapped rooms
appear in the room tree.  Set up unzap capability.  If you click on a room
in the zapped rooms folder it will open in the room view screen.  Clicking
on the zapped rooms folder refreshes the room tree.  Added bitmaps for
goto and for disconnect.  Added a 'zap' button in the room view window.
Added disconnect features so the program will allow for closing a citadel
session and beginning another without shutting down.  Began working on
chat code and configurable citadel sessions (ie, clicking on connect
should prompt you for which bbs you want to go to.)