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Overload of FitResult for general regression model
Add RegressionFitResult as overload of FitResult besides LinearRegressionFitResult, which is logically could be an overload of RegressionFitResult.
Specific properties of LinearRegressionFitResult are Slope, Intercept could be just calls for general Parameter(int i) from RegressionFitResult.
Also RegressionFitResult.Predict(double x, doubple p) would be very-very usefull.