hdf5_ep

[svn-r16284] 
  - h5repack: When user doesn't specify a chunk size, h5repack now defines a default 
            chunk size as the same size of the size of the hyperslab used to read the chunks. 
            The size of the hyperslabs are defined as the size of each dimension or a 
            predefined constant, whatever is smaller. This assures that the chunk 
            read fits in the chunk cache. (PVN - 2008/11/21)

  - H5Dset_extent: when shrinking dimensions, some chunks were not deleted.  
            (PVN - 2009/01/8)