newTriangleModel: Create a new TriangleModel object
In PirateGrunt/MRMR: Multivariate Regression Models for Reserving

Create a new TriangleModel object

1 2	newTriangleModel(Triangle, Response, Predictor, FitCategory, Intercept = FALSE, Alpha = 0, Tail = NULL)

`Triangle`	A Triangle object
`Response`	Character vector indicating the response being measured
`Predictor`	Character vector indicating the variable used to predict the response
`FitCategory`	Character vector indicating the column used to categorize the predictor variable
`Intercept`	Boolean indicating whether or not to include an intercept
`Alpha`	Numeric indicating the parameter used to weight the predictors
`Tail`	Integer indicating the maximum development lag for grouping