[docker][utils] Add script to build docker image for extracted modules (dumux-pub)

See merge request !547

Feature/copy matrix

See merge request !546

* get rid of decltype

* additionally add method to copy back values to multitype blockvector
* clean-up
* improve docu

* remove unused code

* add includes
* improve docu
* use Dune::Hybrid::elementAt insteand of [] for increased flexibility

* use correct values of block size
* remove unused code
* clean-up docu

* Convertes multitype block matrix to plain BCRS matrix
* there is still a bug when numEq != 1

This was simply wrong. However NestedVtkFunction currently doesn't compile
if the mapper is a singlegeomtype mapper as it doesn't allow mapping elements
due to a static_assert.

This reverts commit e7e9c71d.

Feature/3p3c on next

See merge request !508

[staggered][localJacobian] Allow inherting classes access to faceVars

See merge request !545

* Specialization of the localJacobian need access to the non-const
  version of the faceVars. This concept might be revised.

Feature/simplify porousmedium fluxvars

See merge request !544

Should be part of a future PMFlow TypeTag

[fix] add update of subproblemsolution to newtonendstep

See merge request !543

Fix/make testscript compatible for python3

See merge request !538

Fix deprecation warning for Dune MCMG Mapper

See merge request !539

Fix/staggered use num boundary faces from global fv geometry

See merge request !541

* does not make sense for grids with holes in them

* do not use this info from grid(), as some grids do not implement the method

[2p][test] adapt interface of problem for next

See merge request !540

* Dune > 2.5 uses a new interface and only required GridView as template
  argument for the mapper type
* for the constructor, an additional argument is now required:
  elementMapper_(gridView, Dune::mcmgElementLayout())
  vertexMapper_(gridView, Dune::mcmgVertexLayout())