Update fix of normalize_D in the case of wo weights. Add density plot in compute results for all stages and add some plots in results.

Resolve "Visualization"

Closes #13

See merge request !10

Resolve "integration-sota"

See merge request !20

Fix hyperparams bugs in base and random. Fix extracted forest size used in random. Factorize random fitting

Merge branch '17-adding-new-datasets' of https://gitlab.lis-lab.fr/luc.giffon/bolsonaro into 17-adding-new-datasets

Integrate Paolo's code of method 'Ensemble selection from libraries of models' by Rich Caruana et al