very simple datastore reimplementation

[Jameson "Chema" Quinn]

>
> I think expanding the space available to the DS through usb devices or
> sd cards is a use case we should take in consideration when designing
> the DS, even if we don't plan to support it right now.
>
> Marco
>

To be more clear about this use case: I think that there should definitely
be a way for the onboard datastore to store the metadata for an absent file,
with hints about what place(s) to find that file (networked backup, sd
cards, usb devices) and how to recognize it when you do. This should include
the possibility for offloading old intermediate versions. Then, even when
you do not have access to the backup storage, you can see what you are
missing. This makes the result of suddenly yanking the SD card out more
well-defined (assuming no filesystem corruption), and means you do not ever
have to merge/separate two indexes (there is just one index).

Jameson
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