contest form: allow participant_status to be "Mulligan"
scoreboard: show column per round
scoreboard: fix order of per_round columns on scoreboard
scoreboard: minor cosmetic change to legend
scoreboard: ensure games are given in round-order
scoreboard: show ties as separate number in the Score column
schema: s/status/participant_status,

teach scoreboard about mulligans
dashboard: indicate mulligan participants in Games list
dashboard: remove non-functional popup menus for player/game status
dashboard: don't show Run Ratings link if ratings are not enabled