Changed the temporary directory to the system's default location using 'tempfile.mkdtemp'.
This is in response to a post of Edward d'Auvergne at:
https://mail.gna.org/public/relax-devel/2008-07/msg00048.html (message ID:
7f080ed10807291507x5b6aab2fv820a6fc219fc7e2b@...).
