Freeflow/ransncni

See merge request !867

features
* tests for zeroeqni and zeroeq2cni
* split update() in "classical" update() and updateRANSProperties()
* do not use asImp_() but virtual inheritance
* cleanup

Freeflow/cleanup

See merge request !868

Freeflow/ransnc

See merge request !866

* ransnc uses now nPhaseIdx = 1

navierstokes
* make vtkoutputfields more modular

rans
* move eddyViscosity functions to the specific rans implementation

* better distinguish between total mass balance and component mass balances

Feature/gnuplot pipes

See merge request !872

Freeflow/roughness

See merge request !862

* do NOT use updateStaticWallProperties() in problem constructor
* correct calculation of maximum velocity
* add Laufer velocity profile
* update wall variable names

[misc] Fix "coeffiecient" typo

See merge request !863

[cleanup] delete unused simplesteamaircao2h2.hh fluidsystem

Closes #465

See merge request !865

[fix] update dune version control in constraintsolver to master

See merge request !864

The check of the version control using Dune::FMatrixPrecision::set_singular_limit() was removed only on dune-master and not yet on 2.6, therefore the version control is updated so that the ncpflash and pengrobinson tests pass again.

Feature/vtk vector output

See merge request !857

[tabulatedcomp] fill arrays on the fly

See merge request !861

Feature/remove mineralization typetag

Closes #463

See merge request !860

Fix/richardsnc reference

See merge request !858