* Added a script to reduce disk space on a MySQL parser cache setup such as the one...

* Added a script to reduce disk space on a MySQL parser cache setup such as the one at Wikimedia at the moment, by removing all objects which expire before a given time.
* Fixed unintentional shortcut evaluation in MultiWriteBagOStuff::doWrite(). It would have caused writes to be skipped on the second cache if the first cache failed, now writes should be attempted on all caches.