message: ENH: add StructuredMesh::getCellNodeOffsetsArray()
  Add method to return the cell-2-node offsets array.
diff: @@ -314,6 +314,16 @@ public:
  /// \name Cells
  /// @{
  + /*!
  + * \brief Returns the cell node offsets array
  + * \return offsets pointer to the cell-to-node offsets array.
  + *
  + * \post offsets != nullptr
  + */
  + const IndexType* getCellNodeOffsetsArray( ) const
  + { return m_cell_node_offsets; };
  +
  +
  /*!
  * \brief Copy the node IDs of the given cell into the provided buffer.
  *
  