Debugging

* Implemented Boost random system, it is nice. It wasn't too difficult

* Found a critical bug in the message passing algorithm for MRFs (the messages were sent when they shouldn't). Fixed, but we still probably have bugs. Gibbs and message passing still don't agree...

* Cosmetic changes, almost every template is manually instantiated now, which is good. No more #include "xxx.cc" directives

-> continue debugging...