* Fixes for r91123:

* Fixes for r91123:
** Avoid calling protected pageDataFromId() from Article class.
** Made pageDataFromTitle()/pageDataFromId() public for anything else doing something like that (loadPageData was already public anyway).
** Moved getParserOutput() back to Article since it needs getOutputFromWikitext().
* Other: cascading protection side-effect moved to outputWikiText().