message: A fee more sample runs for mandel
diff: // Compile with: make mandel
  //
  // Sample runs: mandel
  +// mandel -m ../../data/inline-tri.mesh
  +// mandel -m ../../data/star-mixed-p2.mesh -a -ncl -1 -sd 4
  +// mandel -m ../../data/klein-bottle.mesh
  +// mandel -m ../../data/inline-hex.mesh
  #include "mfem.hpp"
  #include <fstream>
  