reference result change, but fine solution is still good

Then a lower y^+-value can be chosen

Implement a grid manager class that creates grids and a grid data object. The new class
is no longer a singleton. It is instantiated by the user. It is possible to get a
shared_ptr to the grid data to pass it on to e.g. problem / spatial parameter classes.

* No longer sets the overlap automatically (overlap to be checked by the grid geometry)
* Does not depend on discretization method or TypeTag anymore

Joint work with Kilian Weishaupt <kilian.weishaupt@iws.uni-stuttgart.de>

* index of the pressure has to equal the one of the main component
* advection law does not need outflow information
* fix some reference solutions

Melanie Lipp authored 6 years ago and Dennis Gläser committed 6 years ago

With contributions of Farid Mohammadi <farid.mohammadi@iws.uni-stuttgart.de>.

* Do not pass base class as template parameter for compositional
  localRes and fluxVars

* instead pass base class as template parameter for rans localRes
  and fluxVars

* add test
* add PDELab solution for comparison
* speed-up by avoid calling getparam
* improve determination of the gradient
* increase verbosity for comparison