Ls smallissues

In the current merge request, I have solved some small errors, and added some visualizations

• Adding typing for from from_range method
• Adding y_est_all, with the estimation of all performance attributes to the dictionary provided by the generator
• Created load_all method for the NNmodel to load both datamodule and model, enforcing the required variables into the dataset object
• For the plot distrib_attributes, now it is possible to overlay all figures in a single plot through single_fig = True
• New plotting of the whole grid of specified attributes, with 2d contours