GLV scalar multiplication #70
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Adds improved scalar mul algorithm using the curve cubic endomorphism
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Using the cubic endomorphism in the emulated curves we can reduce the number of constraints for single multiplications:
This improvement may not carry over to batched multiplications, as the benefits of both come from amortizing doublings.
This PR needs the original endomorphism PR to be merged first: privacy-scaling-explorations/halo2curves#24