Proposed changes to security.html

Folks,

I'd like to make two changes to the security.html page:

1) change all references from "contrib modules" to "extensions".  Put a
note on the bottom of the page explaining that they are the same thing.

2) create a second page, security-old.html.  This page would archive the
references to security issues patched on versions no longer under
support (i.e. 8.2 and earlier).

-- 
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com