hdf5

Merging in latest from upstream (HDFFV/hdf5:refs/heads/develop)

* commit 'bbafe0debae9886988e4b7ec31bb8ef7292e43f9':
  Remove extra constant
  Fix typo
  Add Constants to all ERR STK checks
  Use constants for test comparisons
  Develop normalization with vol_integration. Mostly peripheral things like the tools and wrappers, with just enough core library code to support that.