george/prediction_tracker: Manage and score predictions on arbitrary topics. @ 86fed2496cddbfea31587f38e52761e9db54e6c5

George C. Privon 9b161afd64 bugfix in predictions, print Brier score from most recent prediction		vor 6 Jahren
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brier_score.rkt	88e68619e7 Brier score and unit test	vor 6 Jahren
create_database.rkt	3b8fae716c don't force entry of prediction text every time, since prediction has unique ID	vor 6 Jahren
update_predictions.rkt	9b161afd64 bugfix in predictions, print Brier score from most recent prediction	vor 6 Jahren