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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.

Improve documentation structure

See merge request !126

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Remove parameterization C++ class documentation

* Remove unused and deprecated Sphinx syntax
* Update Mathjax link
* Add extension for markdown tables

* Adjust toctree to have proper sections
* Add new doc pages:
  - Feature overview
  - Data I/O
* Add new doc section 'Introduction'
* Rename main file to `index.rst`

Resolve "GradientFluxAdapter problem"

Closes #65 and #62

See merge request !105

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Throw in constructor of RaviartThomasFluxReconstruction if user input
is not supported.

Several instances where stored in shared_ptrs. This seems like a
regression, because the pointers are not actually shared anymore, but
the objects are passed by reference.

Resolve "Implement an abstract base class for initial conditions"

Closes #131

See merge request !129

Resolve "Automatically scale input scaling fields to global grid size"

Closes #120

See merge request !133

Generalization of initial condition specs leads to a change in the API,
but it is no new addition to the program.

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Switch license to GPL-3

See merge request !135

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* This modification allows that it is not needed to know a priori the prescription space, which reduces as well the number of needed instantiations.
* Moreover, now, the flux reconstruction class does not store any shared pointer or reference can may be easily invalidated.