* Refactored Article::getAutosummary(), so there's not a very simple static function...

* Refactored Article::getAutosummary(), so there's not a very simple static function called for every
  autosummary case, instead just include the appropriate code, which makes the whole thing much shorter
  and cleaner.
* Removed Article::getRedirectAutosummary() and Article::getBlankingAutosummary(), which were obsolete
  then.
* Article::getRedirectAutosummary() was called from EditPage::internalAttemptSave() as check if the page
  being edited is a redirect. Replaced that function call with the one-line routine which was used in the
  former Article::getRedirectAutosummary() function. We should have this check in some general static
  function, though.