hdf5_der

Merge pull request #202 in HDFFV/hdf5 from ~DEROBINS/hdf5_der:cache_image_partial to cache_image

Merged fix for H5AC_dump_cache() being unavailable due to #ifdefs.

* commit 'd41426bcf994b8ac1fcf9ef951fcb69cd2e966a2':
  Removed NDEBUG guards from H5AC test functions.