hdf5_ep

[svn-r9117] Purpose:  Minor Bug Fix

Description:  In H5O_fill_new_decode and H5O_fill_new_encode, UINT32DECODE and
UINT32ENCODE were used to decode and encode message size, which is ssize_t.

Solution:  Change to INT32DECODE and INT32ENCODE.

Platforms tested:  fuss - very simple change.

Misc. update: