Port change for http://t2nb.math.washington.edu

[David Kirkby]

The Internet Assigned Numbers Authority (IANA) is responsible for
maintaining the official assignments of port numbers for specific uses

http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers
http://www.iana.org/assignments/port-numbers

IThe default port for a Sage server (8000) is officially reserved for
Remote Desktop Management and so Sage should not be using that port.
This causes a practical problem, as company firewalls are likely to be
open on port 8080, but not on 8000, which at least one Sage user has
found.

As such, I've made http://t2nb.math.washington.edu:8080 be available
on the correct port, which is 8080. It's still available on port 8000,
but if anyone is aware of a reference to this server on port 8000, I
suggest they edit it and change it to 8080. I've done this on
Wikipedia myself, but nowhere else.

As noted elsewhere, I think Sage should change the default port from
8000 to 8080.

Dave

Instead we should use 8080, which is designated as an alternative HTTP server.