4D-OBC change detection: Window_with parameter causes runtime error

[vivienzahs]

For the 4D-OBC change point detection, the window_width parameter is not allowed to be larger than the number of epochs in the dataset. This causes a RunTimeError ("empty score") to be raised during the seed point selection in the region growing any time when having generated the SpatiotemporalAnalysis object based on more than 2 epochs (1 reference epoch + several further epochs).

Maybe the limitation of this parameter to not be larger than the number of epochs in the dataset could be removed and a meaningful error message might be provided to the user to better identify where the issues comes from.

Happy to provide more information if required.