JukeAlert - Added group to /jalist command.
Added group to the /jalist command.  The /jalist command is already
returning quite a lot of data.  I have had to truncate the group list at a
maximum of 20 characters.  If a group is up to this limit, it should display
without a problem.  If its above this limit, it will be dropped to
17 chars and a gray "..." appended to the end of this substring.