hdf5_chunking_query_bmr

Merge pull request #182 in HDFFV/hdf5 from ~DEROBINS/hdf5_der:vs2012_round to develop

Merged fix for missing VS2012 round commands.

* commit '488f19a9cbd2e89e83847a628e59f57f4293fed0':
  Fixed a comment.
  Added Windows-only versions of the round() functions, which do not exist in VS2012 and earlier.