More work.

Change-Id: I3ec5a3b8a58eca8931a19cf31768c63c7502e811
More work (and fingerprints are uint64s now)...

Change-Id: I11d662a9eea76bb25bf1ab307ec7f720509360ba
Almost complete prototype of next-gen storage.

Change-Id: I0c3f53c548378918b7eb1282192cbeac8d7fc91c