NAME
	SetOPen -- Change the Area OutLine pen and turn on Outline
			mode for areafills.

   SYNOPSIS
	SetOPen(rp, pen)

	void SetOPen( struct  RastPort *,  UBYTE );

   FUNCTION
	This is implemented as a c-macro.
	Pen is the pen number that will be used to draw a border
	around an areafill during  AreaEnd().

   INPUTS
	rp = pointer to  RastPort structure
	pen = number  between 0-255

   BUGS

   SEE ALSO
	 AreaEnd()  sc:include/graphics/gfxmacros.h  sc:include/graphics/rastport.h