Commit message was: "* (bug 18958) Added ability to disable entire variant conversion engine per user preferences (languages with language converter class only)"
Reverted because of multiple issues on CodeReview, notably:
* Unexplained rename of a configuration variable, with no backwards-compatibility code.
* Suspected parser cache pollution.
* Variant tabs flip-flop with parser cache misses and hits.
* Hacky implementation: changing configuration variables on the fly is almost always a bad idea, unless you are writing a configuration extension.
* Implementation of default is done as a special case in code accessing the preference, rather than by adding an entry to $wgDefaultUserOptions.
The removed comments are included in MessagesQqq.php togehter with a lot more documentation
Add a link to translatewiki.net too to show users the way to improve translations.
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.
