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Seeing the circuits from Ph(r)asedos/Grapevine project made me realize that
FCircuit
should allow to work with multiple inputs and outputs.Additionally this PR also modifies the
FCircuit
trait to prepare it for the frontend trait, in order to generate the constraints while being inside theAugmentedFCircuit
and being folded at each step (for example for the Circom frontend, which has different needs than the arkworks frontend).