hdf5_ep

Merge pull request #508 in HDFFV/hdf5 from ~BYRN/hdf5_adb:hdf5_1_8 to hdf5_1_8

* commit '073f13ed5fc0190d3ffd4561bbde71c531f08ec8':
  Change position of declaration to top of block
  Change the signature of H5PLget_size function