h4h5tools

Purpose:
    New features
Description:
    1. Add compression support for h4toh5 library. Previously no compression
       support in h4toh5 library. Currently we only handle if the compression
       is implicitly set or the compression is set with gzip. All implicit set compression
       will be used gzip level 9 compression. If the user explicitly use non-gzip compression,
       the converted HDF5 file will not converted. This may be changed later.
    2. Add supporting of zero size unlimited dimension SDS.
Solution:
Platforms tested:
eirene