george/prediction_tracker: Manage and score predictions on arbitrary topics. @ 59fd72bf5b9ee259dbdde72a7e35290918e9d73f

George C. Privon 59fd72bf5b improved output of open predictions		6 lat temu
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brier_score.rkt	88e68619e7 Brier score and unit test	6 lat temu
create_database.rkt	3b8fae716c don't force entry of prediction text every time, since prediction has unique ID	6 lat temu
update_predictions.rkt	59fd72bf5b improved output of open predictions	6 lat temu