move fold step from CompressedSNARK to RecursiveSNARK #295
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Nova paper's description performs a fold step prior to applying a SNARK. Revisiting Nova paper observes that this fold step does not alter the incrementality property.
This PR moves the fold step from CompressedSNARK to RecrursiveSNARK, so the RecursiveSNARK needs to track a single witness rather than two witnesses for the secondary circuit.