* Added new globals to override:
** $wgGroupPermissions : restore default value for anons, some tests don't pass if anons aren't allowed to edit (there isn't "edit section" links)
** $wgDefaultExternalStore : don't use external sotrage since there isn't a table extdb.parsertest_blobs
* return LBFactory::getExternalLB() as reference to avoid an E_NOTICE in ExternalStoreDB::getLoadBalancer()
* remove unused global declaration of $wgExternalServers in LBFactory_Multi::getExternalLB()
* Wrote two concrete implementations. LBFactory_Simple is for general installations. LBFactory_Multi will replace the runtime configuration used on Wikimedia and allow load-balanced connections to any DB.
* Ported Special:Userrights, CentralAuth and OAI audit to the LBFactory system.
* Added ForeignDBViaLBRepo, a file repository which uses LBFactory.
* Removed $wgLoadBalancer and $wgAlternateMaster
* Improved the query group concept to allow failover and lag control
* Improved getReaderIndex(), it will now try all servers before waiting, instead of waiting after each.
* Removed the $fail parameter to getConnection(), obsolete.
* Removed the useless force() function.
* Abstracted the replication position interface to allow for future non-MySQL support.
* Rearranged Database.php. Added a few debugging features.
* Removed ancient benet-specific hack from waitForSlave.php
