Fklearn

- **New**
- Add causal curves summary
- **Bug fix**
- Set correct learner name for learners with column_duplicatable decorator

- **New**
- Add common causal evaluation techniques
- Add methods to debias a dataframe with a treatment T and confounders X

- **Bug fix**
- Remove `cloudpickle` from requirements

- **Bug fix**
- Remove cloudpickle from parallel_validator

- **Enhancement**
- Add verbose method to `validator` and `parallel_validator`
- Add column_duplicator decorator to value_mapper
- *Bug Fix*
- Fix Spatial LC check
- Fix circleci

- **Enhancement**
- Now transformers can create a new column instead of replace the input
- **Bug Fix**
- Make requirements more flexible to cover the latest releases
- split_evaluator_extractor now supports eval_name parameter
- Fixed `drop_first_column` behaviour in onehot categorizer
- **New**
- Add learner to calibrate predictions based on a fairness metric
- **Documentation**
- Fixed docstrings for `reverse_time_learning_curve_splitter` and `feature_importance_backward_selection`