Multi-block object support in keystore.

The main reason for supporting multi-block objects is to allow the
PKCS #11 code to attach more attributes than will fit comfortably in a
single flash block.  This may turn out to be unnecessary once we've
fleshed out the attribute storage and retrieval code; if so, we can
simplify the code, but this way the keystore won't impose arbitrary
(and somewhat inscrutable) size limits on PKCS #11 attributes for
large keys.

This snapshot passes light testing (PKCS #11 "make test" runs), but
the tombstone recovery code in ks_init() is a bit involved, and needs
more testing with simulated failures (probably induced under GDB).

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