2002-04-19  Michael Natterer  <mitch@gimp.org>

	* app/core/gimpdocuments.[ch] (gimp_documents_add): speak in terms
	of "uri", not "filename". Return the created imagefile.

	* app/core/gimpimagefile.[ch]: factored out private function
	gimp_imagefile_save_png_thumb() and call it from
	gimp_imagefile_create_thumbnail().
	Added public function gimp_imagefile_save_thumbnail() which takes
	an imagefile and an image.

	* app/file/file-open.c: create thumbnails for all images opened
	interactively using gimp_imagefile_save_thumbnail().

	* app/xcf/xcf-load.c (xcf_load_image): set the filename with
	gimp_image_set_filename() so it gets converted to an URI as for
	external plug-ins.