CarpetIOHDF5: fix numbering of files when there are fewer than ioprocs than mpi ranks, create output directory on all ranks

Issue #1977 closed
Roland Haas created an issue

The first patch makes it possible to read the generated output files in VisIt without having to rename them since they are now (again) names var.file_0.h5 var.file_1.h5 ... var.file_<nioprocs>.h5 rather than eg var.file_0.h5 var.file_4.h5.

The second one matches what out_vars does.

Pull request is at:

https://bitbucket.org/eschnett/carpet/pull-requests/15/carpetiohdf5-minor-fixes/diff

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