Add automated scoring about dipvis

[UEWBot]

I think this would mean that the list of scoring systems would reside in code rather than in the database, so the existing ScoringSystem class would be removed from models.py and the reference to it from the Round class would have to be changed.

[UEWBot]

Scoring system classes added with 73ef2a8
Game scoring added to views with 7635ac4
Now we need to propagate the scores up to the round and tournament, and to store them in the database when appropriate.

[UEWBot]

Round scoring added to views with cd6dfc8
Tournament scoring added to views with 36c3cf3

The "scores" page now shows "if the tournament ended now" scores.