george/prediction_tracker: Manage and score predictions on arbitrary topics. @ 9b161afd645694385474488ea57840f348cf68bd

George C. Privon 9b161afd64 bugfix in predictions, print Brier score from most recent prediction		%!s(int64=6) %!d(string=hai) anos
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brier_score.rkt	88e68619e7 Brier score and unit test	%!s(int64=6) %!d(string=hai) anos
create_database.rkt	3b8fae716c don't force entry of prediction text every time, since prediction has unique ID	%!s(int64=6) %!d(string=hai) anos
update_predictions.rkt	9b161afd64 bugfix in predictions, print Brier score from most recent prediction	%!s(int64=6) %!d(string=hai) anos