1. New sharing algorithm has been implemented. If intermediate point of some edge is included in the tube with center taken in another edge and radius equaled to maximal vertex-tolerance of both edges then these two edges are considered to be shared. This know-how touches edges only, which have common blocks with interfered faces. If they do not have any common-blocks the algorithm will work as before.
2. Interface of BOPAlgo_PaveFiller::IsExistingPaveBlock(...) method has been changed.
Creation of test case for issues #27128 and #27179
Adjusting some test cases according to their new behavior, because they are IMPROVEMENTS really (TODOs have been deleted).