hdf5_chunking_query_bmr

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

* commit '3211e907f4f9349ba7510d70cfbcc6ee36d99c58':
  Remove vestiges of H5_DEBUG_BUILD macro, switching it to the more standard H5CX_DEBUG form.
  Minor warning cleanup while working on VOL issues.