2006-05-21  Michael Natterer  <mitch@gimp.org>

	* app/core/Makefile.am
	* app/core/gimpimage-item-list.[ch]: new files with functions to
	translate, flip, rotate, transform and align a list of items
	inside an undo group.

	(gimp_image_item_list_get_list): returns a list of items matching
	any combination of GimpItemTypeMask and GimpItemSet.

	* app/core/gimpitem.[ch]: added new function gimp_item_is_in_set().

	* app/core/gimpitem-linked.[ch]: use the new functions. Removed
	gimp_item_linked_get_list().

	* app/tools/gimpeditselectiontool.c: use
	gimp_image_item_list_get_list() instead of
	gimp_item_linked_get_list().

	* app/core/gimpimage-resize.c
	* app/tools/gimpaligntool.c: use the new functions instead of
	creating and iterating the lists manually.