message: fixed mpi header
diff: #define ADIOS2_HELPER_ADIOSNETWORK_H_
  /// \cond EXCLUDE_FROM_DOXYGEN
  -#include <mpi.h>
  #include <string>
  #include <vector>
  /// \endcond
  +#include "adios2/ADIOSMPI.h"
  +
  namespace adios2
  {
  namespace helper
  