2005-04-25  Sven Neumann  <sven@gimp.org>

	* app/plug-in/plug-in-proc-def.h: added a boolean flag to the
	ProcDef struct to identify file procedures.

	* app/xcf/xcf.c: changed accordingly.

	* app/plug-in/plug-ins.c: look at the new flag instead of checking
	extensions, prefixes and magics being non-NULL. A file plug-in
	doesn't necessarily have any of these fields set.

	* app/plug-in/plug-in-rc.c: changed pluginrc format to contain an
	extra section for file procedures. Moved all file related info there.