h4h5tools

Purpose:
bug fix and new features
Description:
1. Originally the converter cannot handle the SDS compression case when the compression dataset
is not chunked. Some flags were set wrongly because of misunderstanding the concepts. Thanks Quinceyfor clarifying the concepts and implementation routines in HDF4.
2. The GR image compression didnot consider the compression without chunking case at all,
This time add it in.
Solution:
Platforms tested:
linux 2.2.18