Add basic physical scaling and Knudsen quality criterion

The paper "Automatic grid refinement criterion for lattice Boltzmann method" [2015]
by Lagrava et al. describes a criterion for measuring the local simulation quality
using a comparison of the theoretical Knudsen number and the quotient of the cells's
non-equilibrium and equilibrium function.

While this criterion was developed to enable automatic selection of areas to be refined,
it also offers a interesting and unique perspective on the fluid structure.

As the criterion requires calculation of the modeled Reynolds-, Mach- and Knudsen-numbers
I took the time to set up the basics for scaling the simulation to actually model a physical
system. Or rather calculating which physical model is represented by the chosen resolution
and relaxation time.

[2015]: https://arxiv.org/abs/1507.06767

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