NAME   
	InitVPort - Initialize ViewPort structure.

   SYNOPSIS
	InitVPort( vp )
		   a0

	void InitViewPort( struct ViewPort * );

   FUNCTION
	Initialize ViewPort structure to default values.

   INPUTS
	vp - pointer to a ViewPort structure

   RESULT
	ViewPort structure set to all 0's. (1.0,1.1)
       New field added SpritePriorities, initialized to 0x24 (1.2)

   BUGS

   SEE ALSO
	MakeVPort() graphics/view.h