Updated passwordsInTheClear-52

 Changes:

Added comments about digest authentication and use of strong passwords.

Previous changes

Updated abstract.
Changed SHOULD NOT send passwords in the clear to MUST NOT and related text
Added information on Digest Authentication vulnerabilities and warning
Added SSL/TLS configuration warning.

http://www.w3.org/2001/tag/doc/passwordsInTheClear-52
http://www.w3.org/2001/tag/doc/passwordsInTheClear-52-20080501.html

Cheers,
Dave