hdf5

Merge pull request #2540 in HDFFV/hdf5 from extend_h5debug to develop

* commit '3f3363177d5cc1efc8fcfc70e1feed7a293da2d4':
  Range check # of 'extra' command-line parameters against array size.
  Refactor "extra" command-line arguments, and clean up code so the tool doesn't assert when exiting.
  Extend h5debug to support 3-D datasets for chunks.