Add widearea_updates table. A very simple mechanism to let Dave auto
update V3 nodes to V4 CDs, and the new image. By inserting an entry into this table, the node will update its image the next time it reboots and checks in for instructions. The actual instructions are hardwired in the web still, but this allows Dave to schedule updates as needed. Eventually, the instructions will be part of the DB state as well, but this works.
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