New ranking method for handling rankings which are not determined by a number of points

[waliens]

Name: RANKING_NO_POINT Would only accept score values in range [1, ..., P] where P is the number of players. Value 1 should be associated to the winning player, while players with other scores are considered to have lost. Scores associated to players should reflect the ranking of the game. In case of ties, a ranking value in the expected range can be reused. Some other values of the said range can therefore be missing in a given game. Even in this case, the score value cannot go over P or below 1.

[waliens]

Fix for ranking computations in 09e775e46