2003-12-09  Michael Natterer  <mitch@gimp.org>

	Fixed memory management of layers and channels which were created
	using the PDB:

	* app/core/gimpitem.[ch]: added "gboolean floating" flag to
	GimpItem. Items are created with floating == TRUE. Added
	gimp_item_sink() which resets the floating flag and unrefs the
	item if it was TRUE.  Added gimp_item_is_floating() accessor.

	* app/core/gimpimage.c (gimp_image_add_layer,channel,vectors):
	g_object_ref()/gimp_item_sink() added items to take ownership of
	them.

	* app/core/gimplayer.c (gimp_layer_add_mask):
	g_object_ref()/gimp_item_sink() the mask.

	* app/gui/layers-commands.c
	* app/xcf/xcf-load.c: don't unref layer masks after adding them to
	the layer.

	* tools/pdbgen/pdb/drawable.pdb (drawable_delete):
	gimp_item_sink() the drawable if it's floating and fail if it's
	not. Fixes bug #128881.

	* tools/pdbgen/pdb/layer.pdb (layer_create_mask): fixed docs.

	* app/pdb/drawable_cmds.c
	* app/pdb/layer_cmds.c
	* libgimp/gimplayer_pdb.c: regenerated.