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Reproducible summation of floating point arrays

Stéphane Del Pinorequested to merge
feature/reproductible-sums into develop

Array sums are reproducible whichever

  • the array ordering is
  • the number of processors is
  • the number of threads is

To use classic sums one can use the --no-reproducible-sums option the default behavior is reproducible summations.

Also merged feature/new_mpi_com_pugs which is used for code coupling

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