Updated passwordsintheclear-52

I've uploaded the latest rev.  This:
- updated the first gpn + related text to what jar agreed to.
- added a security book reference and two links for network and local
authentication.

Available at:
http://www.w3.org/2001/tag/doc/passwordsInTheClear-52
http://www.w3.org/2001/tag/doc/passwordsInTheClear-52-20081008.html

Cheers,
Dave