Used for determining if points are in polygons.
ccw(p0, p1, p2)
returns 1 or 0 depending on position of points
Jonathan M. Lees <firstname.lastname@example.org>
l1 = list(p1=list(x=0, y=0), p2=list(x=1,y=1))
l2 = list(p1=list(x=6, y=4), p2=list(x=-1,y=-12))
ccw(l1$p1, l1$p2, l2$p1)
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