Doxygen documentation update:
* Changed alls @addtogroup to @ingroup. @addtogroup adds the comment to the group description, but doesn't add the file, class, function, ... to the group like @ingroup does. See for example http://svn.wikimedia.org/doc/group__SpecialPage.html where it's impossible to see related files, classes, ... that should belong to that group.
* Added @file to file description, it seems that it should be explicitely decalred for file descriptions, otherwise doxygen will think that the comment document the first class, variabled, function, ... that is in that file.
* Removed some empty comments
* Removed some ?>
Added following groups:
* ExternalStorage
* JobQueue
* MaintenanceLanguage
One more thing: there are still a lot of warnings when generating the doc.
* Cleaned up ApiPageSet::getRedirectTargets(), now uses the redirect table rather than the pagelinks table (this fixes bug 13965)
* Added possibility to obtain all external links through list=exturlusage (per MinuteElectron's request on the mediawiki-api list)
* Added rvprop=size to prop=revisions. Can get the size of all the revisions. The size will not be shown if it is NULL in the database.
* (Experimental) list=allpages now allows to filter by article min/max size and protection status (thanks to [[en:user:madman]] for the idea). The database performance of this addition might be so severe that I might have to remove or restrict it.
Breaking change:
* list=exturlusage XML element's tag is now 'eu' instead of 'p' to be more consistent with the other results.
