show a Login link when not logged in
login: check sysadmin bit at login time
dashboard: check if user is director
enforce permissions on all POST operations
contest page: do not show 'add participant' link if not director
fix bug in is_director() check
tournament.php: implement a page for editing tournament settings
tournament: add field 'multi_game' to indicate whether the tournament is of a variety of board games
remove "Game" field/column from display if multi_game<>'Y'
add a "go back" link on player_scorecard
ratings_functions: fix to handle s/player/person schema change