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Update CI config to use the new runner capabilities

See merge request !108

Remove 'unit_tests_parallel' target and add parallel unit tests to
'unit_tests' target.

Resolve "Implement new parameterization data input"

Closes #86

See merge request !82

Reduce number of CPUs available to DIND runner

* Use InvalidStateException in 'verify_cache'
* Add warning to GridMapper for not load-balancing the grid manually
* Improve docstrings of parameterization test
* Use faster operator[] in FlowParameters::bind

* Add target 'unit_tests_parallel'
* Add two new tests executing two grid creation tests in parallel
* Update names of grid creation ini files
* Fix bug in test-grid-creation.cc that prevented parallel execution
* Add parallel unit tests to existing parallel test job
    and rename it to 'test:parallel'

Update README.md

See merge request !107

Remove section on adding the `dorie` wrapper to the PATH variable
from the installation instructions.

* Mention required input files.
* PFG module is optional.

[ci skip]

* Delete old parameterization, factory, and parameterization base class
* Delete FlowParameters method for copying parameters from the old
    parameterization instances
* Rename 'param_interface.hh' to 'richards_param.hh', to comply to
    other source files directly related to the local operator.
* Rename 'param_richards.hh' to 'param_interface.hh'.

'check_parallel_allowed' is now public, returns a boolean and only
issues a warning if incompatibilities are detected

Grid view does not require memory management

* Reference test now works based on heterogeneous medium
* Add mapping file for test
* Update reference muphi output
* Slightly raise error tolerance

Tests are useless because different compilers yield different results.

* Removed H5 reference files (were deprecated anyway).
* Removed testtools for pfg.
* Removed meta ini file.

* Use heterogeneous parameterization for tests
* Reduce grid size in 3D
* Set custom tolerances to 1E-6

.mini files may specify _abstol and _reltol

Include examples for correct GMSH files, and Python script for
writing a mapping file.

Add additional includes for completeness.

* Remove all config file parameters related to soil parameters.
    Only a lightweight wrapper for dune-randomfield remains.
* Revamp the Python parfield module:
    - Remove all old converters
    - Restructure the base converter to always work upon a random field
    - Add a binary converter for creating a random field of two soil
        layers
    - Remove all submodules related to parameterizations

* Move grid creation out of RichardsSimulation again.
* RichardsSimulation now expects a GridMapper in the constructor.
* GridCreator now returns a shared pointer to GridMapper.
* Moved GridMapper into Dune::Dorie namespace.
* Adapted all tests.
* Fixed indentations in dorie.cc.

Resolve "Modify RichardsSimulation to have the base class #94."

Closes #90 and #95

See merge request !89