Commits
Merge pull request #1666 in HDFFV/hdf5 from ~KOZIOL/hdf5:unwrap_vol_callback to develop * commit '62198c2436ac3787afb49fa990d1ba8204264dba': Add an 'unwrap' VOL callback, so that connectors can unwrap an underlying object without closing it. (Especially needed for pass-through connectors)