clarifying the wording in the selection dialog
removing obsolete function
moving refine_with_user_area to helpers, and implementing in random task
adding manager command to populate task locations (new field)
improve done message for set location manager command
moving email code to helpers, only send email when entire challenge is complete,
not when user's selection has no more tasks.
re-enabling challenge stats - because we can :)
adding messsage saying that stats only apply to current area if defined,
streamlining storing edit area in server session