vchoi_fork

[svn-r1226] Purpose:
    Bug fix
Description:
    dumper repeated output after the 1st 4 rows.
    The bug was because the dumper was reading just a small slice a time
    from the file dataset but did not adjust the offset in the file-space.
    So, it just kept reading the same first slice.
Solution:
    Stole the offset-adjustion code from the routine that h5ls uses.
Platform Tested:
    O2K.