message: ex6p: remove -rm option for a -cs run
diff: // 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 -h1
  -// mpirun -np 4 ex6p -m ../data/square-disc.mesh -rm 1 -o 2 -cs
  +// mpirun -np 4 ex6p -m ../data/square-disc.mesh -o 2 -cs
  // mpirun -np 4 ex6p -m ../data/square-disc-nurbs.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
  