With this pull request, we add the Verma-Pruess porosity-permeability model:
\textbf{k} = \textbf{k}_0 \left(\frac{\phi - \phi_{\textrm{c}}}{\phi_0 - \phi_{\textrm{c}}}\right)^n,where \textbf{k} is the permeability,
\textbf{k}_0 is the initial permeability,
\phi is the porosity,
\phi_0 is the initial porosity,
\phi_{\textrm{c}} is the critical porosity, and
n is the exponent.
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