MPI refactoring

Jakub Klinkovskýrequested to merge
JK/MPI into develop
  • removed __cuda_callable__ from DistributedNDArray and DistributedNDArrayView methods
  • removed MpiCommunicator completely (remains only in the Problems and Solvers machinery)
  • removed wrapper functions AllGroup, NullGroup, NullRequest
  • renamed getCommunicationGroup to getCommunicator in all data structures
  • Array.h, ArrayView.h: replaced send, receive with MPI::send, MPI::recv
  • String.h: replaced mpiSend, mpiReceive with MPI::send, MPI::recv (same as above)
  • removed print method and operator<< for DistributedArray and DistributedArrayView (it does not make sense to print a distributed array like this, because it may contain ghost elements)
  • fixed forElements method in DistributedArray and DistributedArrayView

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