code: def outdated(self):
          
          if hydpy.pub.options.forcecompiling:
              return True
          if os.path.split(hydpy.__path__[0])[-2].endswith('-packages'):
              return False
          if not os.path.exists(self.dllfilepath):
              return True
          cydate = os.stat(self.dllfilepath).st_mtime
          for pysourcefile in self.pysourcefiles:
              pydate = os.stat(pysourcefile).st_mtime
              if pydate > cydate:
                  return True
          return False
docs: True if at least one of the |Cythonizer.pysourcefiles| is
          newer than the compiled file under |Cythonizer.pyxfilepath|,
          otherwise False.