Coding the hybrid dual prediction signal.
Initial modifications to make limited use of common prediction functions. The only functional change thus far is that updates to the probabilities are no longer "damped". This was a testing convenience but in fact seems to help by a little over 0.1% over the derf set. Change-Id: I8b82907d9d6b6a4a075728b60b31ce93392a5f2e
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