Improve Merkle root hashing circuit by 1 constraint / level #820
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This improves the constraints needed by$15.5 n$ to $14.5 n$ , where $n + 1$ is the tree height. The improvement is achieved by reusing computation done internally by two separate calls to
MerkleWitness.calculateRoot()fromCircuit.if.Unrelated: Fixes the changelog which got messed up by merging