anchor.diff:  
   [source,sh]
   ----
  -nvcc -x cu -Ipath/to/feltor/inc -Ipath/to/thrust/thrust -Ipath/to/cusplibrary/cusp test.cpp -o test
  +nvcc -x cu -std=c++11 -Ipath/to/feltor/inc -Ipath/to/thrust/thrust -Ipath/to/cusplibrary/cusp test.cpp -o test
   ./test
   ----
   
  
positive.code: 
  [source,sh]
  ----
  mpic++ -mavx -mfma -fopenmp -DTHRUST_DEVICE_SYSTEM=THRUST_DEVICE_SYSTEM_OMP -Ipath/to/feltor/inc -Ipath/to/thrust/thrust -Ipath/to/cusplibrary/cusp test_mpi.cpp -o test_mpi
  export OMP_NUM_THREADS=2
  mpirun -n 4 ./test_mpi
  ----
  
negative.code: 
  [source,sh]
  ----
  g++ -std=c++11 -fopenmp -mavx -mfma -DTHRUST_DEVICE_SYSTEM=THRUST_DEVICE_SYSTEM_OMP -Ipath/to/feltor/inc -Ipath/to/thrust/thrust -Ipath/to/cusplibrary/cusp test.cpp -o test
  export OMP_NUM_THREADS=4
  ./test
  ----
  