Samples are not square cropped during data loading anymore due to recent
changes. Cropping is model-dependent.

By default, performs sal gen and sal view. Default parameters
are used for now. Steps requiring databases with human annotations
are not yet included in the experiment script.

Add data-model diagram

Closes #24

See merge request biosignal/software/mednet!17

Update documentation

See merge request biosignal/software/mednet!15