Plot the total Dos using DosPlotter()

def plot_dos(self, T=None, npoints=10000):
        """
            Plot the total Dos using DosPlotter()
        """
        if self.bzt_interp is None:
            raise BoltztrapError("BztInterpolator not present")

        tdos = self.bzt_interp.get_dos(T=T,npts_mu=npoints)
        #print(npoints)
        dosPlotter = DosPlotter()
        dosPlotter.add_dos('Total',tdos)

        return dosPlotter