Merge branch '1325-porousmediumflow-2pncmin-nonisothermal-use-current-permeability-for-neumann-gas-flux' into 'master'

[porousmediumflow][2pncmin][nonisothermal] Use current permeability for Neumann gas flux

Closes #1325

See merge request !3742

Erroneous processing of installation doc

Closes #1337

See merge request !3750

Cleanup/box facet dof enrichment

See merge request !3748

Improve Documentation for porous medium models with diffusion and heat conduction

Closes #1314

See merge request !3725

* Fix documentation for Johansen
* Deprecate ThermalConductivitySomerton in favor of ThermalConductivitySomertonTwoP and ThermalConductivitySomertonThreeP
Before they couldn't be included in the same simulation
* Deprecate Dumux::ThermalConductivitySimpleFluidLumping it's the same as Dumux::ThermalConductivityAverage but
the latter works for n fluid phases instead of only two fluid phases

Add new dumux messages.

See merge request !3745

[test][pm][2pncmin][ni]  rename mole and mass fractions

See merge request !3746

Feature/regroup input params

See merge request !3743

[porousmediumflow][2pncmin][nonisothermal] Use mass fractions for diffusive Neumann flux

Closes #1324

See merge request !3740

... as mass-averaged referencing system is used

Remove scvf corner storage for cc-mpfa scvf

See merge request !3739

[ff][brinkman] Add viscosity scaling

See merge request !3737

Feature/brinkman cvfe

Closes #1321

See merge request !3736

[fix][fvproblem] Provide default name

See merge request !3729