george/prediction_tracker: Manage and score predictions on arbitrary topics. @ 0ecc6d5c72982d76497ca089c7d05fcf58a3de61

George C. Privon 0ecc6d5c72 schema bugfix: need a date for each prediction/outcome		6 lat temu
..
brier_score.rkt	88e68619e7 Brier score and unit test	6 lat temu
create_database.rkt	0ecc6d5c72 schema bugfix: need a date for each prediction/outcome	6 lat temu