Improving IntPolyh_MaillageAffinage

Class IntPolyh_MaillageAffinage is used for searching approximate intersection lines for intersection of parametric surfaces.
Algorithm of class builds triangulations for surfaces and searches lines by intersection of triangles.
Disadvantage of algorithm is that triangulation for given surface is built each time when surface participates in intersection, it is not possible to keep ready triangulation and reuse it. It leads to low perfomance of BO and other algorithms when the same faces participate in many intersections.