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returns the relative position of point t
to the oriented circle defined by p, q and r.
The order of the points p, q and r is important,
since it determines the orientation of the implicitly
constructed circle.
If p, q and r are collinear, the circle degenerates in a line. ON_ORIENTED_BOUNDARY is returned if t is also collinear or if two points are identical, otherwise, side_of_oriented_circle(r, q, t, p) is returned. | ||