0023958: Section of shell by plane is incomplete.

0023958: Section of shell by plane is incomplete.
Modifications 1
1. To avoid creation of micro edges in the class BOPAlgo_PaveFiller added two new functions ForceInterfVE and
   ForceInterfVF which updates tolerance of Vertex to make it interfere with Edge and Face accordingly.
2. In the class BOPInt_Tools added new function IsInRange which checks whether two ranges cross each other.
3. In the class BOPTools_AlgoTools added new function IntersectCurves2d which intersects pcurves of the face
   to check it on the self-interference.
4. In the function IntTools_BeanFaceIntersector::FastComputeExactIntersection() the check on the coincidence of the whole
   edge with the face (BOPTools_AlgoTools::IsBlockInOnFace) replaced  with the check on the coincidence of one intermediate point with that face.
5. Test cases bugs modalg_1 bug1255, bug1255_1 has been updated with more correct value of the result.
6. TODO statement has been removed from the test cases boolean bcut_complex B1,B3,B5,C2,C4,C6,C8 as they are correct.

Adding test case for issue CR23958

Modification 2
1. In class BOPAlgo_PaveFiller added new function CheckPlanes(nF1, nF2) that checks whether two planar faces have common or intersecting sub shapes.
If these two faces do not have such sub shapes there is no need to intersect them.
2. In the function BOPAlgo_PaveFiller::MakeBlocks() added block for reducing the tolerance values to the previous state for the vertices
that were put on the section curve (with increasing of its tolerance value) that was rejected by the algorithm.

Modification 3
Back to Extrema_ExtAlgo_Grad algorithm in extrema computations in Boolean Operations algorithm.