Removed the outputPage() method as it mostly duplicated the parent method.

Added prepareQuickTemplate() method instead, with two caveats:
1) prepareQuickTemplate() exists only in 1.23, and
2) ArticleMetaInfo and UserPagePolicy extensions should use the
appropriate hooks instead of these code snippets residing here.

Change-Id: Iaa637472b62bfa3b2ad9789b7f8051208c321bbb