Minor patch from Thomas Gellekum:    * Deletes the Panel_NoArgReturnStringFunction() macro, which isn't used      anymore    * Adjusts two comments.
Minor patch from Thomas Gellekum:
   * Deletes the Panel_NoArgReturnStringFunction() macro, which isn't used
     anymore
   * Adjusts two comments.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator