four main layers:
   toplevel     : startup, initialisation
   listview     : listview, selection, action forwarding
   commands     : bookmark undo/redo mechanism implementation
   actionsimpl  : the actual slots, almost all of 'em

various other thingies:
   search           : incremental search implementation
   favicons         : iterating action implementation using bookmarkiterator
   importers        : forwarders to kio/bookmarks code
   exporters        : forwarders to kio/bookmarks code, and html export code
   dcop             : dcop handling, internal interface
   bookmarkiterator : is a baseclass for iterating actions, of sorts...
   updater          : favicon updating base stuff - kio/khtml crap
   testlink         : link testing stuff

3 different selection styles:
   bookmark iterators (ITR_ACTION)
   single bookmark (ITEM_ACTION)
   normal selection (SELC_ACTION)
