Add comparisons to analytical solutions for Richards model
There are some contributed Richards benchmark in dumux-appl/dumux-rootgrowth. I would be nice to add the analytical solutions (which are not in C++ now) and add tests to dumux.
There are some contributed Richards benchmark in dumux-appl/dumux-rootgrowth. I would be nice to add the analytical solutions (which are not in C++ now) and add tests to dumux.