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Implement new VTK file reader

See merge request !143

Update installation instructions for Ubuntu.
`pip install vtk` suffices for macOS.

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* Install package `python3-vtk7`.
* Disable command line prompts while installing packages.
* Do not install recommended packages.

* Install python3-vtk7 non-interactively.
* Install libxt-dev to see if this suffices.

* Add 'pytest' to dependencies for Python module.
* Add test for VTKReader.
  - Add testing .vtu files.
* Define Python test target.

Also fix a bug where cell data arrays would be ignored.

Capabilities:
* Load any VTK XML file containing a VTK DataSet.
* Evaluate data arrays of cell or point (vertex) data.
* Select data arrays by name.
* Return data set bounds.

Resolve "Implement a class for initial conditions from HDF5 data"

Closes #133

See merge request !130

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* Reformat restart.rst and add warning about WIP state.
* Include TODOs into user docs output.
* Include restart.rst into toctree.

Merge and update user docs.

Add test case for initial condition from H5 data file

* Datafile is specified by "initial.file".
* Interpolation type is specified by "initial.interpolation".

Move code previously located in the ScalingAdapter base class into the
InterpolatorFactory. Destinguish between YAML nodes and Dune
ParameterTree nodes.

Merge delete command into single line because Docker does not accept
multi-line strings

Resolve "Couple the TransportSimulation with RichardsSimulation"

Closes #72 and #101

See merge request !96

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Fix formulae formatting. Add brief descriptions for models.

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Use enable_if instead of run-time exception.

The constructors properly initialize the asserted objects. There is
no point in the code where they can be replaced by empty/null pointers.