2002-05-16  Michael Natterer  <mitch@gimp.org>

	* app/plug-in/plug-in.c: Pass PlugIn, not Gimp pointers to all
	message handler functions so they have a proper context to operate
	on. Use the PlugIn pointer passed instead of "current_plug_in".
	Removed global variables "current_readchannel" and
	"current_writechannel" because it is now always possible to use
	plug_in->my_read and plug_in->my_write.