hdfview

Merge pull request #187 in HDFVIEW/hdfview from ~JHENDERSON/hdfview:master to master

* commit '99cfecbb171aa0356b1cf92e40abbba0023cfc0c':
  Add strict sanity checking for Datatype constructors
  Make createCompoundFieldType() recursive
  Fix H5Datatype createNative() code
  Bring in applicable changes from PR #186
  Post-HDFVIEW-151 merge cleanup