Affine transforms - matrix algebra

[Pavel Safrata]

In consistency with the other methods overloaded for Point vs. the 
direct coordinate values, we should probably add:

     public Point2D transform(double x, double y)
     public Point3D transform(double x, double y, double z)
     public Point2D inverseTransform(double x, double y)
     public Point3D inverseTransform(double x, double y, double z)
     public Point2D deltaTransform(double x, double y)
     public Point3D deltaTransform(double x, double y, double z)
     public Point2D inverseDeltaTransform(double x, double y)
     public Point3D inverseDeltaTransform(double x, double y, double z)

Pavel