MSC: short far _lineto( short x, short y )
		MSC: short far _lineto_w( double wx, double wy )


	- prototype in graph.h

	- draws a line from the current graphics position up to and
	  including the point specified
	- current graphics position is then updated to (x,y)
	- returns nonzero if success; zero otherwise
	- Turbo C uses lineto()