message: Rearrange sample runs in ex6p.
diff: //
  // Compile with: make ex6p
  //
  -// Sample runs: mpirun -np 4 ex6p -m ../data/square-disc.mesh -o 1 -cs
  -// mpirun -np 4 ex6p -m ../data/square-disc.mesh -o 2 -cs
  -// mpirun -np 4 ex6p -m ../data/square-disc.mesh -o 2
  +// Sample runs: mpirun -np 4 ex6p -m ../data/star-hilbert.mesh -o 2
  +// mpirun -np 4 ex6p -m ../data/square-disc.mesh -rm 1 -o 1
  +// mpirun -np 4 ex6p -m ../data/square-disc.mesh -rm 1 -o 2
  +// mpirun -np 4 ex6p -m ../data/square-disc.mesh -rm 1 -o 2 -h1
  // mpirun -np 4 ex6p -m ../data/square-disc-nurbs.mesh -o 2
  -// mpirun -np 4 ex6p -m ../data/star.mesh -o 3
  -// mpirun -np 4 ex6p -m ../data/escher.mesh -o 2 -cs
  -// mpirun -np 4 ex6p -m ../data/escher.mesh -o 2
  // mpirun -np 4 ex6p -m ../data/fichera.mesh -o 2
  +// mpirun -np 4 ex6p -m ../data/escher.mesh -rm 2 -o 2
  +// mpirun -np 4 ex6p -m ../data/escher.mesh -o 2 -cs
  // mpirun -np 4 ex6p -m ../data/disc-nurbs.mesh -o 2
  // mpirun -np 4 ex6p -m ../data/ball-nurbs.mesh
  // 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/inline-segment.mesh -o 1 -md 200
  +// mpirun -np 4 ex6p -m ../data/square-disc-surf.mesh -rm 2 -o 2
  // 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 --restart
  //
  // Device sample runs:
  