h4h5tools

Purpose:
bug fix
Description:
    [describe the bug, or describe the new feature, etc]
one test of h5toh4 (h5toh4 tall.h5 tall.hdf) cause segmention fault
at HP-UX; it turns out to be a bug of setting value across array bound.
Only HP-UX picks this up among IBM SP, linux and solaris.
Solution:
correct it; set the correct array bound.
    [details about the changes, algorithm, etc...]
    [Please as detail as you can since your own explanation is
    better than others guessing it from the code.]
Platforms tested:
HP-UX, windows
    [machines you have tested the changed version.  This is absolute
    important.  Test it out on at least two or three different platforms
    such as Big-endian-32bit (SUN/IRIX), little-endian-32(LINUX) and
    64-bit (IRIX64/UNICOS/DEC-ALPHA) would be good.]