Merge branch 'feature/restart_test' of https://git.iws.uni-stuttgart.de/dumux-repositories/dumux into feature/restart_test

and remove add_executable, target_compiledef

[md][stokesDarcy] Fix calculation of diffusive fluxes over interface

See merge request !1201

[spatialparams][test] free spatial parameters from typetag

See merge request !1192

Fix clang compiler errors

Closes #550

See merge request !1188

* always return molecular diffusive flux, as name suggests

[test] add CMake guards for tests using UMFPack

See merge request !1199

[test][1p][sequential] use parameters instead of properties

See merge request !1198

The properties don't exist anymore. This has gone unnoticed since
SuperLU is available on all test platforms.

[staggered][subdomainlocalassembler] Consider storage term and boundary in…

See merge request !1193

* fixes clang compiler error

* fixes clang compiler error

* resize local objects
* fixes clang error

* fixes clang compiler error

* fixes clang compiler error

* clang won't compile otherwise

* use Dune::Hybrid::elementAt() instead of std::get<>()

* due to a bug in clang (https://stackoverflow.com/a/47849501),
  myMultiTypeBlockvector.size() (which is static constexpr) has to be
  changed to MultiTypeBlockVector::size() to be used as a constexpr
  template argument
* probably a similar issue with using Dune::Hybrid::forEach and std::get<>

[test][cornerpoint] fix bug introduced in 223165a9

See merge request !1196

[staggered][fvElementGeometry] Make ParentType method scvf(globalIdx) available

See merge request !1197

[fix][multidomain][stokesdarcy] fix convective coupling so that it is energy conservative

See merge request !1194

[staggered][subdomainlocalassembler] Consider storage term and boundary in assembling face residual.

Feature/improve 2p1cni

See merge request !1191

* only build two executables

* allows to use thermal non-equilibrium model (T_soil != T_fluid)

* shall not be used but is required in order to fix clang compilation error

[io][gridmanager] Make gridData when making grid from dgf

See merge request !1190