vchoi_fork

[svn-r3003] Purpose:
    Bug fix
Description:
    The optimized MPI-IO calls, H5S_mpio_spaces_write/H5S_mpio_spaces_read,
    are changed for collective data transfer only since they
    call H5FD_mpio_setup to do setup to eveually call MPI_File_set_view
    in H5FD_mpio_read or H5FD_mpio_write.  MPI_File_set_view is a
    collective call.  Letting independent data transfer use this
    route would result in hanging.
Solution:
    For now, the checking is being done in
    H5D_write and H5D_read before H5S_mpio_spaces_write/H5S_mpio_spaces_read
    is called because the checking code in H5S_mpio_spaces_xfer, though with
    the right idea, is not correct yet.
Platforms tested:
    IRIX64-64 parallel.