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Big refactor: traces, queues, encoding stream id and signals in tag

Oskar Lappi requested to merge tag_rewrite into master

Big changes

  • message queues implemented as ring buffers
  • sequences of semantically "together" messages can be sent without interruptions from other streams
  • signals and stream id are encoded transparently in the MPI tag, but can be recovered from the delivered message
  • channel and channel_map traces can be recorded and read (but no replays yet)

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