socks5 support

[Michael Robinton]

> On Fri, 10 May 2002, Michael Robinton wrote:
> :Good luck, I sent in a patch for socks5 support back in October of
> last :year and got blown out of the water by the "developers".
>
> This is best handled by a ProxyCommand helper.
>
ProxyCommand helper does not allow you to bridge multiple socks
servers since it knows nothing about the next server.

i.e. to go from behind firewall A over the internet to B then behind
firewall B transparently.

Michael