1999-08-19  Michael Natterer  <mitschel@cs.tu-berlin.de>

	* app/Makefile.am
	* app/gimpdnd.h: new file containing the dnd data definitions.

	* app/disp_callbacks.[ch]
	* app/interface.c: drop layers on the toolbox to create a new
	image and on the display to copy it to the image's layer stack.

	* app/layers_dialog.c: drop layer on the "New" button to create an
	empty layer with the dropped layer's properties, to "Duplicate" to
	duplicate it and on the trashcan to delete it.
	Thanks to Andy for the ultra-cool dnd preview pixmap patch.

	* app/layer.[ch]
	* app/undo.c: renamed layer_mask() to layer_get_mask(). Prototyped
	some function headers.

	* app/disp_callbacks.c: Wheelmouse stuff: Shift+wheel scales the
	display.

	* app/airbrush.c
	* app/eraser.c
	* app/paint_options.h
	* app/paintbrush.c
	* app/pencil.c
	* app/tool_options.c: moved the "Incremental" toggle to the
	PaintOptions structure because it is used more often now.