hdf5_der

Merge pull request #163 in HDFFV/hdf5 from ~KOZIOL/hdf5:develop_merge_revise_chunks_08 to develop

* commit 'eba0ff43c968ef9a0b09edf19c1e337cfcae0816':
  Remove 'clear' callback from metadata cache client interface, using the new 'entry cleaned' notify action innstead.