2003-07-15  Michael Natterer  <mitch@gimp.org>

	* app/paint/gimppaintoptions.[ch]: took the fade options out of
	GimpGradientOptions and added them to the new GimpFadeOptions
	struct. Added a GObject::finalize() implementation.

	* app/paint/gimppaintbrush.[ch]: changed accordingly. Made
	gimp_paintbrush_motion() a protected function and renamed it to
	_gimp_paintbrush_motion() added a "gdouble opacity" parameter so
	an initial brush opacity can be passed in by subclasses.

	* app/paint/gimpairbrush.[ch]: derive it from GimpPaintbrush so it
	gets all its rendering features. Removed own rendering code and
	use _gimp_paintbrush_motion(), passing airbrush_options->pressure
	as initial opacity. Removed all static variables.

	* app/tools/gimpairbrushtool.[ch]
	* app/tools/gimppenciltool.[ch]: derive them from GimpPaintbrushTool.

	* app/tools/gimppaintoptions-gui.c: changed accordingly. Added the
	full paintbrush options overkill to the airbrush GUI. Cleanup.

	* app/tools/gimperasertool.c: forgot to remove the "Hard Edge"
	toggle here.