2004-11-13  Sven Neumann  <sven@gimp.org>

	* app/plug-in/plug-in-proc-def.[ch]
	* app/plug-in/plug-in-rc.c
	* app/plug-in/plug-ins.[ch]: allow to associate a procedure for
	thumbnail loading with any file load procedure.

	* tools/pdbgen/pdb/fileops.pdb: export this functionality to the
	PDB as gimp_register_thumbnail_loader().

	* app/pdb/fileops_cmds.c
	* app/pdb/internal_procs.c
	* libgimp/gimpfileops_pdb.[ch]: regenerated.

	* app/core/gimpimagefile.c
	* app/file/file-open.[ch]: when creating a thumbnail for an image
	file, use a thumbnail load procedure if available.

	* plug-ins/common/svg.c: added "file_svg_load_thumb", a procedure
	that allows to load a small preview of the SVG image.