in the stats method, added the norm operation; revised the polyfit method, making it possible to evaluate previsouly-computed polynomials; removed updatinf the labels from operations; fixed minor bug in the plot method
in the stats method, added the norm operation; revised the polyfit method, making it possible to evaluate previsouly-computed polynomials; removed updatinf the labels from operations; fixed minor bug in the plot method

jgte/orb,jgte/orb,jgte/orb,jgte/orb,jgte/orb