add option 'use_person_ordinal' to control person Ordinals
schema: rename multi_table to multi_venue
contest: rename 'board' column to 'venue', and make it ref. venue table
schema: transfer boards into venues
scoreboard: use template row to construct rows
scoreboard: include player ordinals if available
scoreboard: make the round-robin result columns configurable
scoreboard: enhance to work with non-Go seat names