2003-09-29  Michael Natterer  <mitch@gimp.org>

	Fixed handling of G_PARAM_CONSTRUCT_ONLY properties:

	* app/config/gimpconfig.c (gimp_config_iface_duplicate): build
	a GParameter array of G_PARAM_CONSTRUCT_ONLY properties and
	use g_object_newv() instead of g_object_new() to create the
	copy.

	* app/config/gimpconfig-utils.c
	(gimp_config_copy_properties)
	(gimp_consif_reset_properties): don't try to copy/reset
	G_PARAM_CONSTRUCT_ONLY properties because it is impossible.

	(gimp_config_connect_notify): ditto. Also don't try to read
	from unreadable or write to unwritable properties.