Aggsig signature subtraction function, rust side #81
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Note this depends on: mimblewimble/secp256k1-zkp#67, that will need to be merged and the submodule updated before this change can be commit.
The rust FFI interface + api implementation of
subtract_partial_signature
, along with some test additions to exercise and verify it. Will only be used in the experimental contracts wallet branch for early payment proof verification.