code: def _already_resized_on_flickr(self,fn,pid,_megapixels):
          
          logger.debug("%s - resize requested"%(fn))
          # Get width/height from flickr
          width_flickr,height_flickr=self._getphoto_originalsize(pid)
          # Now compute what image will be if we resize it
          new_width,new_height=pusher_utils.resize_compute_width_height(\
                  fn,_megapixels)
          if width_flickr==new_width and height_flickr==new_height:
              return True
          # Also return true if image couldn't be resized
          elif not new_width:
              return True
          return False
docs: Checks if image file (fn) with photo_id (pid) has already
          been resized on flickr. If so, returns True