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      describing a set of 3D points, and a 4 node ("linear")
      tet mesh of those points.  It creates a "quadratic" tet
      mesh, which has the same number of tetrahedrons, but in
      which each tetrahedron is defined by 10 nodes.  In the process,
      it adds just enough nodes, at the midsides of the edges of
      the original mesh, to define the new mesh.  The data defining
      the new mesh is written out to files for further use.
    </p>

    <p>
      The refinement of a sing