2001-04-29  Michael Natterer  <mitch@gimp.org>

	* app/gimplayer.[ch]: added a "linked_changed" signal and emit it
	in gimp_layer_set_linked().

	* app/gui/layers-dialog.c: use the accessor when setting "linked".

	* app/widgets/gimpdrawablelistitem.[ch]: made the hacks which make
	the buttons look nice inside list items available to subclasses.

	* app/widgets/gimplayerlistitem.[ch]: added a "linked" button.