[2p2csequential][test] Update ref solution

See merge request !454

[staggeredGrid][localJacobian] Fix compiler error with clang

See merge request !449

* clang yielded a linker error related to the array-type baseEps

Merge branch 'solverdocumentation' into 'master'

See merge request !444

[improve linear solver documentation] add information on solver and preconditioner

See merge request !357

[staggered][localResidual] Allow resizing of faceResidual vector

See merge request !440

* method evalFace() has now an optional bool parameter to specify whether the face
  residual should be resized
* this is important to avoid a segfault when only calling this method without
  having called eval() before, which is done e.g. in the multidimension coupling
  localJacobian

Merge branch 'fix/compiler-warnings' into 'next'

See merge request !439

[test][io] Fix compiler warnings

See merge request !437

Merge branch 'fix/guardian-macro' into 'next'

See merge request !438

[constraintsolvers] Fix guardian macro

See merge request !435

Merge branch 'cleanup/cakegridcreator' into 'master'

See merge request !436

[io][cake][cleanup] Remove debug output and other improvements

See merge request !407

Feature/add coupled assembly for box

See merge request !433

* temporary commit

* still incomplete

* buildLowDimMatrixBlocks_()
* buildBulkMatrixBlocks_()

* TODO: correct box-versions of buildLowDimMatrixBlocks_ and
  buildBulkMatrixBlocks_

Merge branch 'fix/co2restart' into 'next'

See merge request !429

[tests][co2] Correct restart time

See merge request !428

Merge branch 'fix/test_ccadaptive2p' into 'next'

See merge request !426

Fix of ccadaptive2p assertion error

See merge request !425

(cherry picked from commit 7ab1887c)

(cherry picked from commit 3b62b6af)
(cherry picked from commit 75b72cb5)

(cherry picked from commit 1d7f6b3a)

[staggered][freeflow] Use new dirichlet interface for pressure term

See merge request !423

* forgotten during transition to new interface

[staggered][localJacobian] Allow inheritance

See merge request !422

* Make formerly private members protected

Feature/improve staggered

See merge request !419

* dirichlet(element, scvf)

* dirichlet(element, scvf)

*Used for creating ghost faces

Merge branch 'fix/el2p-test' into 'next'

See merge request !418

[test] Fix el2p problem

See merge request !417