DUCT initial implementation

[jfransman]

Implementation of the Distributed Upper Confidence Tree (DUCT) algorithm based on: Brammert Ottens, Christos Dimitrakakis, Boi Faltings. DUCT: An Upper Confidence Bound Approach to Distributed Constraint Optimisation Problems ACM Transactions on Intelligent Systems and Technology, ACM, In press, 8 (5), pp.1 - 27. 10.1145/3066156 . hal-01593215