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- perf_mbytes is a global used later in pdf generation, do not overwrite
  in stdio output parsing

- resolve warnings
- make format more consistent

we should probably always include logs that contain dxt data in
the example output directory so we can track that module over
releases

fix __wrap_H5get_libversion undefined reference

See merge request !18

- reported by Jialin Liu
- triggered by some HDF5 programs
- solved by eliminating incomplete wrapper mechanisms for H5get_libversion()
  and invoking it directly (Darshan needs to use, not wrap, this
  function)

Update darshan-job-summary.pl.in

See merge request !17

utility was trying to aggregate DXT records, which have no
record aggregation function