hdf5_ep

[svn-r6900] Purpose:
    Bug fix

Description:
    Fix three (!) bugs in szip filter:
        - we were using bytes per pixel instead of bits per pixel
        - we were using the size of the slowest changing dimension instead of
            the fastest changing dimension to compute the blocks per scanline
            parameter
        - we swapped two parameters when setting up szip_options block.

Solution:
    Addressed bugs above.

Platforms tested:
    FreeBSD 4.8 (sleipnir)
    h5committest not needed