Vít Hanousek authored 6 years ago and Jakub Klinkovský committed 6 years ago

   -rename directions to ZvYvXv, where v is m,z,p
   -correct y direction in 2D

- There is an RAII wrapper called ScopedInitializer to handle
  finalization due to C++ exceptions and to avoid calls to Finalize in
  all exit branches.
- Fixed signature of MpiCommunicator::Init to match that of MPI_Init.

It should not be called "base" because inheritance does not work for the
constexpr methods.

Since CUDA 9 nvcc seems to be able to handle the templates behind Mesh.