hdf5_der

Merge pull request #211 in HDFFV/hdf5 from ~DEROBINS/hdf5_der:cache_image_partial to cache_image

Merged H5MF whitespace and parens changes

* commit 'dc256af241b9d081421ac73c103bbc69aa77aacf':
  H5MF code tidy before final evict-on-close merge.