Change default for USE_MODIFIED_NEWTON to true#478
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We have seen in the cadet-julia benchmark paper, that the modified Newton method is oftentimes more efficient when combined with the (linear) DG discretization, while its less efficient for FV.
When changing the default to modified newton, Ive observed that some tests loose accuracy.. maybe its not a good idea to make this the new default after all, especially considering non-linear bindings and the future development of non-linear DG.
I think we should choose stability/accuracy over efficiency for now and use this draft here for more rigorous benchmarking.
See #221