"I wouldn't object to stylizing the API code to bring it in line with
the rest of MW on principle, but I'm not gonna bother myself." --Roan
<http://www.mediawiki.org/wiki/Special:Code/MediaWiki/60657#c5108>
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* Move export/exportnowrap handling code out of the if(count($pages)) branch
* Add an error fallback to ApiFormatRaw (exportnowrap uses the XML formatter for errors), since Raw doesn't know how to format errors
* Accessed through the export and exportnowrap parameters added to action=query
* To facilitate &exportnowrap, add ApiFormatRaw, a formatter that just spits out its input without any formatting (not accessible through &format= of course)
* Fix up the action=query description message to reflect the deprecation of query.php
