hdf5

Merge pull request #737 in HDFFV/hdf5 from ~LRKNOX/hdf5_lrk:hdf5_1_8 to hdf5_1_8

* commit 'e57c83fce0b1b68b57098fe8a5da378095086103':
  Update version string on hdf5_1_8 development branch following creation of new hdf5_1_8_20 branch.