Naive Bayes CPD + Classify.ecl cleaning …

Naive Bayes:
- Add Class Probability Distribution to discrete and continuous NB
- ClassifyD and ClassifyC use CPD to calculate final class
Classify.ecl
- Delete Raw function, CrossAssigment delivers wiser aggregation results.
- Delete HeadLine function, Accuracy is the commonly used term.
- Delete closest_conf from l_results, only was used in NB classication stage, not anymore.
- Clean all the ecl-ml modules referring to Raw, HeadLine or closest_conf.