hdf5_ep

[svn-r2590] Purpose:
    Bug fix
Description:
    The old code was using count as the block size.  The result was
    asking for a slab of count blocks, each of 1 element.  The recent
    change in the hyperslab algorithm exposed this problem.  (The
    old algorithm merge the count blocks back into 1 big block of
    count elements.)  (This error was due to that the block argument
    was not in the very early version of hyperslab.  Then it was
    not updated since it had been "working".)
Solution:
    Added in the block argument to the setup and calculation of
    slab and its data.  Also found a dumb error in the dataset_fill
    algorithm in which stride was used in the calculation.  Not so
    for the cases of BYROW and BYCOL.
Platforms tested:
    modi4 parallel, both -64 an -n32 modes.