Is there anyway to change a group leader?  For example, I have three heroes in one group.  Since most of their names are so ridiculous I can never remember them, let's call them Bob, Hank, and Phil.  Bob is the group leader, but only has 4 spell points.  Phil has 10 and can cast teleport, but since he is not the leader, it doesn't work.  Is there a stat that determines the group leader, or is it random?  I know if the monarch is in the group, he or she is the leader, but I am talking about other groups.