hdf5_ep

Merge pull request #302 in HDFFV/hdf5 from merge_page_buffering_02 to develop

* commit '101fa7af8ebe26ad015b64d3b881df8a9124ccc2':
  Cleanups and normalizations against incoming page_buffering changes.
  Switch major error code from H5E_FSPACE [back] to H5E_RESOURCE
  Misc. style cleanups from the page_buffering branch.