hdf5

Merge pull request #341 in HDFFV/hdf5 from ~MAINZER/hdf5_jrm:develop to develop

* commit 'b7c58f7dfca66d4caa26d7f8b318ad3514b8c46f':
  Minor code changes to address comments in pull request
  Checkin of additions to cache image parallel test code and associated bug fixes.