message: strong witness compatibility
diff: @@ -14,6 +14,8 @@ public:
  typedef Simplex_ptr Simplex_handle;
  + typedef void Insertion_result_type;
  +
  /** \brief Inserts a given range `Gudhi::rips_complex::Rips_complex::OneSkeletonGraph` in the simplicial
  * complex. */
  template<class OneSkeletonGraph>
  