Smurff

Updated Python API for inference
Speedup in PredictionSession and MacauOnePrior
Fixes for logging in Jupyter Notebooks
Fixes in propageted posterior dimension checking

This version adds support for predictions with more than 2 dimensions.

Updated documentation and small fixes for predictions.

See:
- docs/notebooks/syn_out_matrix_prediction.ipynb
- python/smurff/smurff/predict.py

SMURFF now supports BPMF with Posterior Propagation