PPTP support for NetworkManager

Added by Antony Mee http://www.students.ncl.ac.uk/a.j.mee
Based entirely on OpenVPN support by Tim Niemueller http://www.niemueller.de

This requires the Linux PPTP client installed 
http://pptpclient.sourceforge.net/

TODO: Support for passwords stored outside of /etc/ppp/chap-secrets

Code released under the GPL. See COPYING file in the NetworkManager
directory.

Aachen, 2005/11/12