2002-09-28  Havoc Pennington  <hp@pobox.com>

	* src/window.c, src/stack.c: Rewrite stack code to work a lot
	differently. Should be better now, and not lose relative positions
	of windows when moving among layers. Also should now be possible
	to get session management to restore the stacking order.  Probably
	breaks some stuff, and makes all the stack.c changes I made
	yesterday sort of irrelevant.