! Copyright (c) 1990-1997  Michael Sandrof, Troy Rollo, Matthew Green,
! and other ircII contributors.
!
! All rights reserved.  See the HELP IRCII COPYRIGHT file for more
! information.
!
Usage: ON [#|+|-|^|&|@]LEAVE [-|^]<parameters> [action]
  This is activated whenever someone leaves a channel you are on.  
  The parameters for the action are as follows:
    $0    nickname of person who left the channel
    $1    the channel which which was left
    $2    the optional part message
