prompt2PortMeasure

      prompt2PortMeasure    Uses prompt1PortSOL to get SOL measurements at each port,
                            and an additional thru measurement
         Sm = prompt2PortMeasure(vnakit,settings,ports,name,sw_corr)
         input:
              vnakit: (the board) object
              settings: vnakit settings object
              ports: port mapping dictionary
              name (optional): name of component is printed in the prompt
              sw_corr: (bool) will switch correction be applied
          output:
              Sm: [2,2,num_pts] measured S-parameters