message: Code review: use std::sort instead of std::stable_sort
diff: @@ -380,7 +380,7 @@ class Flag_complex_sparse_matrix {
  #ifdef GUDHI_USE_TBB
  tbb::parallel_sort(f_edge_vector_.begin(), f_edge_vector_.end(), sort_by_filtration);
  #else
  - std::stable_sort(f_edge_vector_.begin(), f_edge_vector_.end(), sort_by_filtration);
  + std::sort(f_edge_vector_.begin(), f_edge_vector_.end(), sort_by_filtration);
  #endif
  // Initializing sparse_row_adjacency_matrix_, This is a row-major sparse matrix.
  