hdf5_ep

[svn-r2647] Purpose:
    Bug fiX
Description:
    H5S_hyper_select_valid would report hyperslab invalid if the one of
    the count values is zero.  The verifying algorithm did not take into
    consideration that block or count can contain zeros to indicate no
    element is wanted.
Solution:
    Added code to test if block or count is zero.  If so, skip the rest
    of the validity check.
Platforms tested:
    IRIX64 -64.