Start a rewrite of the basis classes
Wrote base classes Node, Deterministic and Stochastic. Trying to make old demos work.
Fix message mask bug in Node
Working on PCA demo
Working on PCA demo
Fix mask bug in Dot
Add minor TODO
Fix nodes to use the new classes Deterministic and Stochastic
Fixing Gaussian mixture demo
Fix Gaussian mixture demo
Fix Categorical demo
Fix Kalman filter demo
Fix Gaussian Markov chain demo
Fix drifting LSSM demo
Minor change in drifting LSSM demo
Merge refactorization of the node structure to master