HEAD and Stable, together

The Stable tag has been moved up to the most recent code, as some critical fixes required what’s in the most recent code. In general, this should only be positive, unless you are using unionfs or nullfs, as they will be broken if you upgrade. So, if you are using those file systems, hold off on upgrading for a few weeks. When you do upgrade, it has to be a full buildkernel/buildworld.