Improve Temperature Stabilization #100
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The previous temperature stabilization code did not include a dependence on
dt, the time step size. This PR adds new definitions which fix this issue and result in greatly reduced spurious oscillation in the temperature solve. See Figure 1 below, where the 1st row reflects no stabilization, the 2nd row reflects our previous approach, and the 3rd and 4th row are obtained with the options contained in this PR.