- Introducing oriented circles to help avoid jumping points

- Allow for a circle degenerating into a line for CircleCircleIntersection

- Allow for oriented arcs (similarly to oriented circles)

- Treat the case of a circle that degenerates into a line in circle-line intersection,
  also the case of both circles that degenerate to a line for a circle-circle intersection
  comparison with machine epsilon is changed to much larger value, using isSingular