2004-02-17  Michael Natterer  <mitch@gimp.org>

	Make sure each GimpItem emits "removed" when it is removed from
	the image so dialogs have a chance to close themselves:

	* app/core/gimplayer.c (gimp_layer_apply_mask): emit "removed"
	from the mask.

	(gimp_layer_removed): new function which emits "removed" from
	the layer's mask when the layer gets removed from the image.

	* app/core/gimpimage.c (gimp_image_dispose): emit "removed"
	from all layers, channels and vectors.

	* app/gui/layers-commands.c (layers_scale_layer_query)
	(layers_resize_layer_query): removed recently added connections to
	"removed" because GimpViewableDialog does this automatically.