Per Platonides, follow-up r72842: pass the db connection to SiteStatsInit::doAllAndCo...

Per Platonides, follow-up r72842: pass the db connection to SiteStatsInit::doAllAndCommit(). Changed parameters to that functions to give as first parameter a db connection and merged existing ones in the second parameter which is now an array of options (and is also much, much easier to read that those boolean parameters). No other calls in core or extensions.