code: def hdrval(cls):
          
  
          dict = {'Itn': 'Iter'}
          dict.update(cls.hdrval_objfun)
          dict.update({'Rsdl': 'Rsdl', 'F': 'F_Btrack', 'Q': 'Q_Btrack',
                       'It_Bt': 'IterBTrack', 'L': 'L'})
  
          return dict
docs: Construct dictionary mapping display column title to
          IterationStats entries.