2003-05-09  Michael Natterer  <mitch@gimp.org>

	* app/core/gimpimage-crop.c (gimp_image_crop)
	* app/core/gimpimage-resize.c (gimp_image_resize)
	* app/core/gimpimage-scale.c (gimp_image_scale):
	don't #include "gimpchannel.h". Moved code around so they all do
	their stuff in the same order (improves readability when comparing
	the functions). Use GimpItem variables instead of GimpChannel or
	GimpLayer ones. Lots of cleanup.