Calls like
  const auto& element = *gridView.template begin<0>();
result in element referencing a temporary. Use a copy instead:
  const auto element = *gridView.template begin<0>();

For the adaptive decoupled models, several loops could not be
adapted. In particular, incrementation of iterators is used not
only for loop steering. Moreover, iterators are explicitly stored.

Some tests still use the GridView's begin method explicitly in order
to obtain the first element with which some calculations are
performed. It should be evaluated if this can be circumvented.

As for other LocalResiduals, IntersectionIterators could not be
eliminated from the Stokesnc(ni)CouplingLocalResiduals, since they
are used as parameters for functions.

Similar to box and cellcentered, there remains an IntersectionIterator
in stokeslocalresidual.hh.

A few occurrences in boxlocalresidual.hh and cclocalresidual.hh
could not be adapted yet, since some functions get an
IntersectionIterator as parameter. This should be treated as a
separate issue.

Employ the possibility to use range-for-loops for iterating over
entities and intersections. As a first step, modify the implicit
2p model and the central infrastructure in implicit/common and
implicit/box.

(reviewed by bernd)

(reviewed by fetzer)

Tests now use input files instead of command line input.
Simulation time changed to the original setup with 1e6 s of initialisation and 1e6 s of injection. Reference files are adapted accordingly.
Name of the executable for both the parallel and the non-parallel test is now the same.
(reviewed by fetzer)

After removing uses of DUNE_VERSION_NEWER I forgot to get rid of the
include dune/common/version.hh.
(reviewed by fetzer)

Follow dunegrid30 changes



See merge request !8

The former has been removed in dune-grid 3.0-git.

Remove dune23 compatibility



See merge request !7

Remove INSTALL and replace by INSTALL.cmake. This still needs some
love to reflect the current situation.

Feature/externalscript

Gstat wird nicht mehr weiterentwickelt und das package vom gstat server compiliert nicht, daher habe ich gstat rausgenommen. Man kann es nun aber IWS intern vom tiki runterziehen.

See merge request !5

Apply it also in the external script. The patch
makes entities copy assignable.

Cleanup/elementpointer

Removes all occurences of ```EntityPointer``` (except multidomain).

Removes deprecation warnings related to ```EntityPointer```s.

All methods returning ```EntityPointer``` now return Entities.

```InteractionVolume```s in decoupled store ```ElementSeed```s.

```CCElementGeometry``` stores ```Element```s.

See merge request !4

Thanks Christoph for the bugreport.

(reviewed by fetzer)