protocol clarity

So I've finished my analysis of the protocol stuff in squid - protocol_t
etc.

http://wiki.squid-cache.org/ForwardRework has some thoughts about how we
can improve the current api, to make SSL fit in more cleanly, and make
doing some nifty things, like forwarding via ssh tunnels, or peers that
need a vpn etc, easy to do.

-Rob

-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.