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

	* app/gui/convert-dialog.[ch] (convert_dialog_new): changed
	GimpDisplay* parameter to GimpProgress* because that's what it's
	used for.

	* app/actions/image-commands.c (image_convert_cmd_callback):
	changed accordingly.

	* app/gui/convert-dialog.c: massively cleaned up internals. Use a
	GimpViewableButton + GimpContainerEntry combo as in text options
	for selecting the custom palette. Use a filtered container which
	contains only palettes with a maximum of 256 colors.
	Fixes bug #136574