2005-07-10  Manish Singh  <yosh@gimp.org>

        * libgimp/gimplayer.c (gimp_layer_set_preserve_trans): actually
        return a value.

        * plug-ins/pygimp/pygimp-drawable.c: create new lock_alpha attribute,
        and deprecate old preserve_trans attribute.

        * plug-ins/pygimp/plug-ins/shadow_bevel.py: use new lock_alpha API.