Server going down briefly tonight fro some emergency maintenance and preparation for the larger rollout of dataset 3.

Shouldn't be more than an hour or so. Sorry for the lack of notice.

Maintenance is done. More test WUs for dataset3 are out. The server-side validation is still in flux for dataset 3 (while not breaking dataset1 and 2). It's a little bit trickier than we thought, but is the only thing holding back wider release of dataset3.