Add some more unittests to cover the following functions
all writers: binary_size(BaseExporter& _be, Options _opt)
- jacobi smoother with C1 continuity
- some function in IOmanager
- McDecimaterT::decimate_constraints_only
- PolyConnectivity::is_collapse_ok
- PolyConnectivity::is_simple_link(EdgeHandle _eh)/ PolyConnectivity::is_simply_connected(FaceHandle _fh)
- PolyConnectivity::remove_edge(EdgeHandle _eh) / PolyConnectivity::insert_edge(HalfedgeHandle _prev_heh, HalfedgeHandle _next_heh) / void PolyConnectivity::reinsert_edge(EdgeHandle _eh) / PolyConnectivity::split_edge/PolyConnectivity::split_edge_copy
- PolyConnectivity::triangulate()
- ArrayKernel::assign_connectivity
- TriConnectivity::vertex_split/ TriConnectivity::insert_loop / TriConnectivity::insert_edge / TriConnectivity::split_copy