Database interface

See merge request !200

Implemented new database interface

Implemented new database interface

Merge 'fix-gen' (already applied on 'master') onto 'dask-pipelines'

See merge request !199

Negative and Positive score generation used the same constant instead of
the intended two assigned higher.

Fixed baselines whose uses estimator.fit

See merge request !197

Fix checkpoint

See merge request !196

keys had not enough info to differentiate the scores in score_writer
used the path of the probe sample instead of its subject id

Redoing baselines

See merge request !192