CarpetIOHDF5: add option to have one output file per process

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Issue #1976 closed
Roland Haas created an issue

This is useful when running on systems where many files slow down file access (ie lustre file systems) and where there are many hdf5 output files per MPI rank.

The code combines all output into a file $parfile.h5 which is currently hard-coded.

https://bitbucket.org/eschnett/carpet/pull-requests/14/carpetiohdf5-add-option-to-have-one-output/diff

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