hdf5_ep

[svn-r5875] Purpose:
    Additional regression tests & bug fixes

Description:
    There was no testing for the H5Dget_storage_size function and it seemed to
    be having problems with compressed, chunked datasets, so write some tests
    to verify that its working correctly.

    Also, fix case for allocating storage early for chunked datasets

Platforms tested:
    FreeBSD 4.6 (sleipnir) serial & parallel