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Signed-off-by: Santiago Ospina <saospina@hugo.iwr.uni-heidelberg.de>

Signed-off-by: Santiago Ospina <saospina@hugo.iwr.uni-heidelberg.de>

Signed-off-by: Santiago Ospina <saospina@hugo.iwr.uni-heidelberg.de>

Signed-off-by: Santiago Ospina <saospina@hugo.iwr.uni-heidelberg.de>

Signed-off-by: Santiago Ospina <saospina@hugo.iwr.uni-heidelberg.de>

Change multicore runner usage

See merge request !59

[ci skip]

MAKE_FLAGS as environment variables still applied although they were not
set in the 'dunecontrol' command

* build:main now uses default runner
* test:parallel now uses multicore runner

Add explicit compiler specification to debug-clang build

See merge request !57

Use auto block size deduction for QkDG FEM

See merge request !56

Resolve "Add additional debug job with Clang"

Closes #69

See merge request !54

Specify compilers through build-arg CC and CXX of Dockerfiles

* Split setup CI stage into two jobs for GCC and Clang
* Add compiler (CC) as ARG in Dockerfile
* Remove dune-env-clang.dockerfile

[ci skip]

Based on regular (GCC) DUNE env image

Resolve "Update to DUNE v2.6"

Closes #68

See merge request !53

Target builds a derived class of Simulation and will hence emit all
warnings

[ci skip]

Concerns parallel_reference_compare test

* Raise DUNE versions to v2.6
* Raise dependency versions to packages included in Ubuntu 18.04
* Remove badges
* Fix 'docker build' command with path to Dockerfile
* Update installation instructions for Ubuntu
* Move interactive Docker session further down

* Set blocking sizes for vector backends
    - QkDG is falsely set to 1 due to runtime error
* Use namespace PDELab::ISTL instead of PDELab::istl
* Use new MCMGMapper constructor with layout functor
* Use Dune::GeometryTypes for FEM construction
* Remove includes of deprecated header
    <dune/pdelab/common/referenceelements.hh>
* Fix bug where MatrixBackend in AdaptivityHandler would store entries
    per row as double

This reverts commit 3de62db0.

This reverts commit 2971b6d1.

This reverts commit 8185d6fe.