Fix Triangulator for the case of self-intersecting but valid polygon
+ some fixes for #16469
1) ElementsOnShape: fix too high octree of classifiers in case of large tolerance
2) SMESH_MeshEditor::SewFreeBorder() SIGSEGV on over-constrained elements
3) Project(): adjust radius to avoid checking too many elements
4) Protect SMESH_Gen_i::Compute() from CORBA error in case of a removed mesh
5) smeshBuilder.Mesh.FindCoincidentNodesOnPart() - fix for a case of ID list
