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Suppress some printing to stdout during parallel execution

In parallel execution mode, every core prints two things:

  1. "Using seed XXXX", this info is only useful in serial mode when you can specify a seed
  2. "No active particles remain on processor XX"... this prints the simulation time when the last particle left the domain, but it's not needed.

When 8000 cores print a variant of the same message to stdout, the output becomes tedious to navigate.