the algorithm for fastkdtree-raytracing is working!

~FIX: the SAH did not split the cubes AABB up. turned the move on the
upper side +1 to the z-direction. now the cube is splitted up.

~FIX: mathutils: returns the absolut value when intersecting with a
triangle, as "-1" must be reserved for no intersection

~FIX: made a mistake with the trianlge iterator. now it works fine.
Needed to reset the triangleIterator after check the interscetion in an
AABB

~FIX: added a fix to the happah.pro "-fpermissive", so the code compile
which simon coded