Integrate intrahost model into precomputations

[priesgo]

This is the last and bets one analysis/classifiers/xg_D.tuned.joblib

TODO:

• [ ] recalculate dN/dS only on data before the cutoff date + retrain model
• [ ] recalculate dN/dS on full dataset + retrain model without cutoff date

Here is how to load the model, gather features and predict analysis/06_prediction_and_validation.ipynb