- Add stage4 (results and experiments);
- Do not save model object.

- Remove extracted_forest_sizes_number parameter from compute_results.py and retreive the value instead;
- Add almost all remaining experiment config files of stages 1, 2 and 3;
- Add almost all remaining result plots of stages 1, 2 and 3;
- Add some temporary scripts to run all stages experiments.

- Fix possible issues for extracted forest sizes computation: around to reduce possible zeroes and remove duplicates;
- Create output experiment stage dir if not exists;
- Add base_score_metric to model raw results class;
- Add best params for lfw_pairs (maybe try with a larger number of random seeds since the score is not that high).