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() graphics/gfxmacros.h graphics/rastport.h