2005-05-06  Sven Neumann  <sven@gimp.org>

	* app/actions/layers-actions.c
	* app/core/gimpimage.c (gimp_image_position_layer)
	* app/widgets/gimplayertreeview.c (gimp_layer_tree_view_drop_possible):
	drop the limitation that layers not at the bottom of the stack
	have to have an alpha channel. Allow the user to move the
	background layer up in the stack or reposition it using DND.

	* tips/gimp-tips.xml.in: changed the relevant tip and some more.