2004-09-22  Michael Natterer  <mitch@gimp.org>

	* app/plug-in/plug-in-types.h

	* app/plug-in/plug-in.[ch]: added struct PlugInProcFrame which
	contains the ProcRecord, the proc's GMainLoop and its return
	values.

	Use the same struct for the plug-in's main proc and its
	temp_procs, so we finally have one set of return values per call
	frame, and not just one per plug-in.

	Added plug_in_proc_frame_push()/pop() and changed
	plug_in_main_loop[_quit]() accordingly.

	* app/plug-in/plug-in-message.c
	* app/plug-in/plug-in-progress.c
	* app/plug-in/plug-in-run.c: changed accordingly.