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Implements convience functions for
* outflow conditions
* advective turbulence fluxes

* Make sure that the diffusion tests use the same time step sizes
* Update reference solutions according the new time steps

[doxygen] exclude tests from doxygen to reduce doxygen size and runtime

Closes #887

See merge request !2141

Feature/navier stokes darcy convtest

See merge request !2128

[test] Use python3 for test wrappers

See merge request !2138

[cmake] Require CMake 3.13

See merge request !2136

* based on Schneider et al. 2019:
  Coupling staggered-grid and MPFA finite volume methods for
  free flow/porous-medium flow problems

Export element type  in FV element geometry

See merge request !2132

Fix/staggered upwindfluxvars

See merge request !2133

cleanup/staggeredupwindfluxvars ifconstexpr

See merge request !2127

[freeflow][staggeredupwindfluxvars] reduce the doLateralMomentumUpwinding_ functions with if constexpr

[freeflow][staggeredupwindfluxvars] reduce the getLateralUpwindingMomental_ functions with if constexpr

[freeflow][staggeredupwindfluxvars] reduce the getFrontalUpwindingMomenta_ functions with if constexpr

[freeflow][staggeredupwindfluxvars] reduce the doFrontalMomentumUpwinding_ functions with if constexpr

[cleanup] Remove unused typedefs

See merge request !2124