1. Methods ClearVertexes(), RemoveVertex(...) and InsertVertexBefore(...) was added to the IntPatch_WLine class.
2. Function IsSame(...) for IntSurf_PntOn2S was added (see IntSurf_PntOn2S.cdl for detail information).
3. Concatenate WLine got if it is possible.
Some test cases were changed according to their new behavior.