Michael Zingale

## PR summary this allows these constants to be used with the exact Riemann solver ## PR motivation ## PR checklist - [ ] test suite needs to be run...

move Riemann history constants to riemann_constants namespace

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## PR summary ## PR motivation ## PR checklist - [ ] test suite needs to be run on this PR - [ ] this PR will change answers in...

clang-tidy on MHD

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this also fixes a issue with degeneracy in the eigenvectors ## PR summary ## PR motivation ## PR checklist - [ ] test suite needs to be run on this...

the case of projecting against div{U} was not including area factors ## PR summary ## PR motivation ## PR checklist - [ ] test suite needs to be run on...

a setup for exploring shock burning

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## PR summary ## PR motivation ## PR checklist - [ ] test suite needs to be run on this PR - [ ] this PR will change answers in...