because side of a point w.r.t. a segment cannot be done with rescaling,
due to rounding the point can be located on the other side of the segment
This adds 4 more failing testcases, but it has to be done first because
the solution is not reliable
A robust type is integer for float/double. The rescaled points will only
be used for side-information and equality and distance-comparisons, not
to calculate the intersection points themselves.
Currently the code is #ifdefed
