Adding MPIDimsCreateError exception.

/***************************************************************************

                          MPIDimsCreateError.h  -  description

                             -------------------

    begin                : Jan 30, 2019

    copyright            : (C) 2019 by Tomas Oberhuber et al.

    email                : tomas.oberhuber@fjfi.cvut.cz

 ***************************************************************************/

/* See Copyright Notice in tnl/Copyright */

#pragma once

#include <stdexcept>

namespace TNL {

namespace Exceptions {

struct MPIDimsCreateError

   : public std::runtime_error

{

   MPIDimsCreateError()

   : std::runtime_error( "The program tries to call MPI_Dims_create with wrong dimensions."

                         "Non of the dimensions is zero and product of all dimensions does not fit with number of MPI processes." )

   {}

};

} // namespace Exceptions

} // namespace TNL