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Parallel io improvements

Matthieu Schaller requested to merge parallel_io_improvements into master

A bunch of improvements to the parallel HDF5 i/o building on the discussion with the developers.

  • Get rank 0 to create the file and empty datasets.

  • Open the file then in parallel with all the ranks.

  • Write the data in parallel.

  • If the library is recent enough, switch on the parallel write of the meta-data.

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