Camera: needsupdate, isoustanding for (un) subscription\n
Room: needsupdate, get oustanding updates\n
Room: changed selection is now dependend on all cameras\n
ConnectionManager: Bugfix wrong error message on unsubscription if not
registered\n
ListCamerasActivity: Subscription implemented\n
RoomListviewAdapter: Graphical improvements if needsupdate and
checkboxes