remove the awaiting_network states from dochandle #363
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This removes the AWAITING_NETWORK and NETWORK_READY states from DocHandle -- instead, the Repo just waits until the networksubsystem is in a sync-able state before triggering synchronization.
Note that this patch caused me to notice (but not yet fix) a subtle problem: if you have no local data AND you try but do not succeed in connecting to the network, you will never enter "unavailable" and your handle will lurk in "loading" forever more.
I suspect we can untangle that particular problem as we go on the cleanup but I wanted to note it.