Add check of input data source before processing windowing

[FlorentinTh]

Currently, the windowing module is responsible for the sanitization of raw data.

This code should be moved to a new LE2ML module in order to take benefit of modularity and to be able to use some parameters for slicing raw data either from start or end of the input file in case of raw data are considered to be a signal.

EDIT :
Leave the code in this module, but add a check of the data source before applying the whole windowing process including sanitization task.