Add tests for Koren reconstruction scheme

[jbreue16]

PR #112 added a Koren-type reconstruction FV scheme, we need to add tests for that.

[WFlynnZ]

Since this is implemented in the axial convection-dispersion equation, I assume you guys must already have similar test cases for WENO schemes. Do you want to use those, or the one (case 6, first order rxn system) in our part I paper. @jbreue16

[jbreue16]

We dont need to reproduce the test from the paper.
I think we can test this only for the LRM, just to make sure the scheme works.
In my opinion we should simply compute the LRM linear benchmark example, for which we already have the analytical solution, with all reconstruction schemes and make sure they all work for a specific tolerance.
If we wanted to be even more rigorous, we could implement an EOC test for all schemes in python and add this to CADET-Reference.

We can also share the work and I can add the C++ test and you can provide the python scripts, which you probably already have and only need slight modification?

On the python side:

• Use the setting defined in cadet::JsonParameterProvider createLinearBenchmark in line 877 of the JsonTestModels.cpp
• Either modify your own EOC test from the part I paper or reuse the infrastructure provided in CADET-Reference to create an EOC test. The latter should be easy, you can probably just copy paste another test and give it a different CADET-Setting.
• Use the analytical reference solution which we have stored under test\data\lrm-pulseBenchmark.data
• Add the EOC script to CADET-Reference (or send me the file if you dont have write access)

On the C++ side:

• adapt the cadet::test::column::FVparams to allow any reconstruction scheme
• add a new test file to the testrunner with accuracy tests for all reconstruction schemes for the analytical linear binding benchmark case