Bug report - Data Transformation Normalise

[pollytur]

This actually would not work for any other folder name for the TreeDataset. For instance, if the folder is named 'videos'

Here is how this is solved inside neuropredictors for now. I would propose such a modification also to keep it back compatible.

`def init(self, data, stats_source="all", exclude=None, inputs_mean=None, inputs_std=None,
in_name=None, out_name=None, eye_name=None):

    self.exclude = exclude or []
    if in_name is None:
        in_name = "images" if "images" in data.statistics.keys() else "inputs"
    if out_name is None:    
        out_name = "responses" if "responses" in data.statistics.keys() else "targets"
    if eye_name is None:
        eye_name = "pupil_center" if "pupil_center" in data.data_keys else "eye_position"`

[pollytur]

Also, why do we have normalisation of trial_idx here? This does not make any sense for me, but maybe I miss something...