Game player 'detail' link should lookup model for inbound links directly to games

[amj]

e.g.

https://cloudygo.com/v16-19x19/joseki/full/1548398561-tpu-player-deployment-d74dbc759-27cfr-7.sgf

[sethtroisi]

This requires an index on filename which increases database size ~30% which will be >10gb so I'm going to not implement at this time.

If there are more use cases (than joseki explorer) I'm happy to reconsider.

[sethtroisi]

start = 52.1 gb

sqlite> delete from games where model_id not between 16000000 and 16999999;

vacuum => 6.2 gb

sqlite> delete from eval_games where model_id_1 not between 16000000 and 16999999;

vacuum => 5.5 gb

eval_models, model_stats

vacuum => 5.4 gb

CREATE INDEX game_name ON games (filename);

=> 6.8 gb