Integrate support for Bayesian Decision Networks

[hbuschme]

Either migrate the implementation from the primo-legacy branch or integrate the results of M. Holland's Master's thesis (“Dynamische Decision Netzwerke für kooperative Mensch-Maschine-Interaktion”), which was implemented as a part of PRIMO and is therefore LGPL-v3 licensed (by infection).

[hbuschme]

The code from M. Hollands thesis now resides in my branch Holland2016-MSc. It builds upon the code in primo-legacy and thus branches off at that point.