hdf5_ep

[svn-r7457] Purpose:
    Bug fix.

Description:
    Correct bug where a file opened twice, once with read-write permission
and once with read-only permission would cause closing the file with the
read-only file ID to fail because it was trying to flush information out
of the file.

Solution:
    Check the permissions on file IDs that are being closed and only flush
when the particular file ID was opened with write permission.

Platforms tested:
    FreeBSD 4.9 (sleipnir)
    too small to need h5committest

Misc. update: