Adds a fit point to the spline.
object is an progeCAD Spline object;
Index is a Long Integer variable (or value) identifying the position in which to add the fit point. If the index is a negative number, then the point is added to the beginning of the spline. If the index exceeds the number of fit points in the spline, then the point is added to the end of the spline.
FitPoint is the progeCAD Point object to be added.