Auto-Detect when changing params in dataset_balanced_division_to_folds(reset_split=False)

[SagiPolaczek]

Is your feature request related to a problem? Please describe.
When calling dataset_balanced_division_to_folds(reset_split=False) we don't look at the parameters:

    if os.path.exists(output_split_filename) and not reset_split:
        return load_pickle(output_split_filename)
    else:
...

Meaning that if output_split_filename exists, the changes won't take place. Thus the user needs to change it manually or worse, be confused with the results.

Describe the solution you'd like
When necessary, auto-reset the split file.

Describe alternatives you've considered

1. Save the parameters in the split file (or hash them) and read them each time, looking for a diff.
2. Save the parameters (or hash them) in a different file.
3. Manually inspect the parameters.

Additional context
:)

[SagiPolaczek]

Partially addressed in #312