hdf5

Merge pull request #2173 in HDFFV/hdf5 from ~BYRN/hdf5_adb:develop to develop

* commit '576e713924b1802a64ae2f6655d2389d70fadfd1':
  Add new h5diff files
  Fix compile statement order
  HDFFV-10976,-10980 Init obj_type before calling H5Rget_obj_type3
  Add unknown define for h5dump ref objects
  Standalone doesn't use h5test implementation.
  HDFFV-10980 - h5diff uses new ref APIs