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

	More transform stuff virtualization:

	* app/core/gimpitem.[ch]: added new virtual function
	GimpItem::resize().

	* app/core/gimpchannel.[ch]
	* app/core/gimplayer.[ch]: removed public resize functions
	and implement resize() instead.

	* app/core/gimpdrawable.c: implement resize() which contains
	the common parts of layer/channel resizing.

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

	* app/core/gimpimage-crop.c
	* app/core/gimpimage-resize.c
	* app/gui/layers-commands.c
	* tools/pdbgen/pdb/layer.pdb: changed accordingly.

	* app/pdb/layer_cmds.c: regenerated.