Consider support for HDF5 I/O backend, perhaps via ADIOS 2?

[p-costa]

Right now I/O is handled using pure MPI I/O onto raw binary files, which are visualized using XDMF metadata files. XDMF also supports HDF5 files, so the differences in visualization post-processing workflow would be minor.

For later reference: https://adios2.readthedocs.io