message: ex6p: put amr-quad run before the --restart run.
diff: // mpirun -np 4 ex6p -m ../data/pipe-nurbs.mesh
  // mpirun -np 4 ex6p -m ../data/star-surf.mesh -o 2
  // mpirun -np 4 ex6p -m ../data/square-disc-surf.mesh -o 2 -cs
  -// mpirun -np 4 ex6p -m ../data/amr-quad.mesh
  // mpirun -np 4 ex6p -m ../data/inline-segment.mesh -o 1 -md 200
  +// mpirun -np 4 ex6p -m ../data/amr-quad.mesh
  // mpirun -np 4 ex6p --restart
  //
  // Device sample runs:
  