PFI insight!

To assist users in improving the dataset a PFI analysis would be helpfull!

Also a API would be nice to use all them MBconfig stuff without the UI but just called from software!
like:

```
var Trainresult = Train(datapath, "label", PredictionTypes.Price);

foreach(var col in Trainresult.PFI)
Debug.Write(col);

var PredictionEngine = Trainresult.PredictionEngine;
Featuredata = new float[]{1,1.2,4.6,7.1};
var Prediction = PredictionEngine predict (Featuredata );
```