Thyra: Add support for x_dot_dot
Created by: rppawlo
We are adding second time derivative support to the new Tempus time integration package. This requires the model evaluator to support x_dot_dot and a corresponding multiplier (omega) for use in W evaluation:
W= omegaD(f)/D(x_dot_dot)+alphaD(f)/D(x_dot)+beta*D(f)/D(x)