hdf5

Merge pull request #1995 in HDFFV/hdf5 from ~LRKNOX/hdf5_lrk:hdf5_1_12 to hdf5_1_12

* commit '5c61be3de285b3a9a63d623944e13892a8a8cb94':
  Final improvements.
  Fix errors in testh5dump.sh tests that grep for reference error messages.