message: Accommodate for refactored bp function in sst
diff: @@ -83,7 +83,8 @@ void SstWriter::EndStep()
  };
  m_BP3Serializer->CloseStream(m_IO, true);
  - m_BP3Serializer->AggregateCollectiveMetadata();
  + m_BP3Serializer->AggregateCollectiveMetadata(
  + m_MPIComm, m_BP3Serializer->m_Metadata, true);
  BP3DataBlock *newblock = new BP3DataBlock;
  newblock->metadata.DataSize =
  m_BP3Serializer->m_Metadata.m_Buffer.size();
  