Documentation is a bit unclear

The documentation for `incircle`, `orient2d` and `orient3d` all speak of "counterclockwise order", but without specifying the assumed handedness of the coordinate system, this is fairly meaningless.

The documentation for `insphere` speaks of the points needing to be in a "positive orientation". It is unclear what is meant by this. I'm also not sure if this is in any way intuitively quantifyable? Perhaps something along the lines of: a positive orientation is where point d is on the left or right (whichever is applicable, handedness applies here as well) of the plane defined by the triangle abc. I'm not sure whether this definition always holds, though.