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NAME

	MoveLayer -- Move layer to new position in BitMap.

	result = MoveLayer( dummy, l, dx, dy )
	d0                  a0     a1 d0  d1
	LONG MoveLayer( LONG, struct Layer *, LONG, LONG);

	Move this layer to new position in shared BitMap.
	If any refresh layers become revealed, collect damage and
	set REFRESH bit in layer Flags.

	dummy - unused
	l - pointer to a nonbackdrop layer
	dx - delta to add to current x position
	dy - delta to add to current y position

	result - TRUE if operation successful
	         FALSE if failed (out of memory)

	May not handle (dx,dy) which attempts to move the layer outside the
	layer's RastPort->BitMap bounds .