2003-11-26  Michael Natterer  <mitch@gimp.org>

	* app/core/core-enums.[ch]: added enum values
	GIMP_ADD_ALPHA_MASK_TRANSFER and GIMP_UNDO_GROUP_LAYER_ADD_MASK.

	* app/core/gimplayer.c (gimp_layer_create_mask): applied patch
	from Pedro Gimeno which implements the new ADD_MASK type and
	added undo. Fixes bug #127930.

	* app/gui/layers-commands.c: push an undo group around layer mask
	creation & adding since the creation may change the layer now.

	* app/pdb/layer_cmds.c
	* libgimp/gimpenums.h
	* plug-ins/pygimp/gimpenums.py
	* plug-ins/script-fu/script-fu-constants.c
	* tools/pdbgen/enums.pl: regenerated.