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Thermalized LB: test 4 rel time model velocity and pressure fluctuations
This changes the fluctuating LB test to match as closely as possible what we are going to use.
Model with 4 relaxation times for shear/bulk/odd/even modes.
Tests:
mass conservation
momentum conservation
<m v^2> = k_B T
Maxwell velocity distribution
average stress tensor
stress tensor fluctuations accodring to Duenweg, Schiller, Ladd