The original draft spec for RedJubjub did not include key prefixing, and
both this reference implementation and the Rust implementation were
implemented following that spec. Then when key prefixing was added, the
Rust code was updated at its call sites instead of inside the RedJubjub
implementation.
Now that we are migrating to the `redjubjub` crate which correctly builds
in key prefixing, the old test vectors can no longer be used.
As of this commit, this only affects the Sapling test vectors (we still sample the same
randomness to avoid disturbing the others).
A "diversifier_index" field is added to the Unified Address test vectors. (This is not needed
for UIVKs/UFVKs since they do not depend on the diversifier index for any protocol.)
We also add an "account" field to make the account number explicit, even though it could be
inferred from the test vector index.
Signed-off-by: Daira Hopwood <daira@jacaranda.org>