Keep track of missing dependencies both in memory and in the index's underlying sorted.KeyValue. When we see a dependent blob arrive, see if we can reindex things. Fixes camlistore.org/issue/102 Change-Id: I3d8cfc463e4b8c9d158be8f9656e772839b093b9
Change-Id: Ie18c8db5ab33e94a6c37e3fa19170ac046d864b2
Change-Id: Id4d8b761cd81a7c8abd7e21d139bffc818aff5e1
Change-Id: Ifba96f21d5a003150062d988129c2c24fcae878c