* msgbase.c: cmd_move(): Fix the security logic for non-aides trying to

* msgbase.c: cmd_move(): Fix the security logic for non-aides trying to
  move or copy messages.  The logic should do the following:
  * Allow move/copy for Aides
  * Allow regular users to:
    * Move a message between two personal rooms
    * Copy a message from a Personal room to a room the user is subscribed to
    * Copy a message from a room the user is subscribed to, to a personal room
  * Prohibit other moves/copies