1999-08-20  Michael Natterer  <mitschel@cs.tu-berlin.de>

	* app/Makefile.am
	* app/gimpdnd.c: new file. Contains a function which creates dnd
	preview icons for all kinds of drawables.

	* app/gimpdnd.h: added the new dnd types.

	* app/channels_dialog.c: same dnd functions as in the layers
	dialog. Fixed channels_dialog_flush(). Code cleanup.

	* app/layers_dialog.c: enabled dnd for layer masks.

	* app/disp_callbacks.c
	* app/interface.c: dnd code generalization. The toolbox and the
	display accept drop of any kind of drawable now.

	* app/gimage.h
	* app/gimpimage.[ch]: new function gimp_image_position_channel().

	* app/layer.[ch]: new function layer_mask_get_layer().