make.pd.game: Generate an iterated Prisoners Dilemma game
In skranz/StratTourn: Tournament of game theoretic strategies

Generate an iterated Prisoners Dilemma game

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make.pd.game(uCC = 1, uCD = -1, uDC = 2, uDD = 0, digits = 2,
  err.D.prob = 0, err.C.prob = 0, private.signals = FALSE, delta = 0.9,
  ...)

`uCC`	Utility in the case 'both players cooperate'. If specified in form of a vector (e.g. c(0,2)), then a random value is uniformly drawn each round and presented to the strategies.
`uCD`	Utility in the case 'I cooperate, but the other one doesn't'. If specified in form of a vector (e.g. c(0,2)), then a random value is uniformly drawn each round and presented to the strategies.
`uDC`	Utility in the case 'I defect, but the other one cooperates'. If specified in form of a vector (e.g. c(0,2)), then a random value is uniformly drawn each round and presented to the strategies.
`uDD`	Utility in the case 'both players defect'. If specified in form of a vector (e.g. c(0,2)), then a random value is uniformly drawn each round and presented to the strategies.
`digits`	If the costs are drawn from a uniform distribution: To how many digits should the draw be rounded?
`err.D.prob`	Probability that a cooperation is seen as a defection, i.e. the propability to erroneous see a D
`err.C.prob`	Probability that a defection is seen as a cooperation, i.e. the propability to erroneous see a C
`private.signals`	If TRUE, then every player always sees his own action as originaly intended. He can no longer see whether his action in the previous round was due to an error.
`delta`	Probability of playing another round