Fix the main files

[pantoniad]

Serious problem with the main files: The non-iterative implementation of an iterative process

So each main file consists of the same process copied and pasted for each operating point. This was done in the begging to ease out the burden of having to re-code the script into an iterative process.

Up until now, there has not been any problems with the script, except the fact that there was a tiny naming error on nearly all learning curves, for the Gradient Boosting main file. In the inputs of the corresponding function, the dataset for the corresponding operating point is required but, by mistake, I have not changed the name of the dataframe at each operating point, resulting on all of the learning curves being the same... (the were all using the data from the Idle operating point...). The same problem does not exist in the polynomial regressor, so this must have been a by-product of a later differentiation.

The above problem has now been fixed () but an iterative process should used instead, to limit such syntax problems in the future...