The default page header should use the Page Header property

Summary: Eric expected to be able to examine the default header, to base his own Page Header on. This reminded me that there's no way to do Refresh from QL yet.

Really, we should stop hardcoding the default header in the client -- while it's convenient from an efficiency perspective, it's just plain wrong at this point. Instead, there should be a default value of Page Header, probably on Thing, that works normally.

Note that this requires that all of the hardcoded crap in the current default header have corresponding QL functions. That should be true anyway.

This actually proves to be kinda tricky. Downgrading to High, since it's going to need some serious time.