2003-05-07  Michael Natterer  <mitch@gimp.org>

	Started to abstract item transformation so we can easily
	transform multiple linked items later:

	* app/core/gimpitem.[ch]: added new virtual function
	GimpItem::scale() with the same signature as the former
	gimp_layer_scale_lowlevel().

	* app/core/gimpdrawable.c: implement scale() and do the
	common parts of layer/channel scaling here.

	* app/core/gimpchannel.[ch]
	* app/core/gimplayer.[ch]: implement scale() for the
	channel/layer specific parts of scaling.

	* app/core/gimplayer.[ch]: renamed gimp_layer_scale() to
	gimp_layer_scale_by_origin().

	* app/vectors/gimpvectors.c: added empty scale() implementation.

	* app/core/gimpimage-scale.c
	* app/core/gimpimage-undo-push.c
	* app/gui/layers-commands.c
	* tools/pdbgen/pdb/layer.pdb: changed accordingly.

	* app/pdb/layer_cmds.c: regenerated.

	Unrelated:

	* app/core/gimpimage-undo-push.c: fixed item rename undo to
	take the size of the saved name into account. Removed old
	path_undo stuff.