IOI submission server (IOI participants only, for now)

[Gordon V. Cormack]

The IOI submission server is available to IOI participants who
remember their login codes:

https://cforall.uwaterloo.ca:8443

You can download your submissions, and even resubmit if you like.

At some point, we will probably have to move the server to a
new location. Also at some point, we will figure out a
mechanism to give access to non-IOI participants.

[Gordon V. Cormack]

All demo accounts (mailed to IOI participants before IOI)
should now work on the submission server.