2005-07-30  Sven Neumann  <sven@gimp.org>

	* app/display/gimpdisplayshell-render.c
	* app/display/gimpdisplayshell.[ch]: renamed overlay to mask and
	added a different overlay implementation that will be needed to
	finish the new foreground-select tool.

	* app/tools/gimpforegroundselecttool.c: changed accordingly.