code: def get_shiftfile_row(self):
          
          if self.fit is not None:
              rowstr = '%s    %0.6f  %0.6f    %0.6f     %0.6f   %0.6f  %0.6f\n'%(
                      self.name,self.fit['offset'][0],self.fit['offset'][1],
                      self.fit['rot'],self.fit['scale'][0],
                      self.fit['rms'][0],self.fit['rms'][1])
          else:
              rowstr = None
          return rowstr
docs: Return the information for a shiftfile for this image to provide
              compatability with the IRAF-based MultiDrizzle.