message: helper: Implement Comm::BroadcastFile in terms of our encapsulation
diff: @@ -123,8 +123,7 @@ std::string Comm::BroadcastFile(const std::string &fileName,
  const std::string hint,
  const int rankSource) const
  {
  - int rank;
  - MPI_Comm_rank(m_MPIComm, &rank);
  + int rank = this->Rank();
  std::string fileContents;
  // Read the file on rank 0 and broadcast it to everybody else
  