Score wrapping

On some games it is possible to loop the score. This has always been the case but is a greater issue on games where it is possible to learn policies that plays forever, e.g. on Atlantis. There should be a unifying scheme for dealing with score wrapping in games where this can occur. Either:
1. The episode should terminate (and the game can be considered "solved"), or
2. All evaluations should take place within strict time limitations.

Note that there are games, e.g. Krull, where a simple agent can loop the score without achieving anything meaningful. This needs to be taken into consideration when evaluating agents that loop the score.