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implement reference state in MHD PLM
PR summary
This implements the reference state in the characteristic project a la Colella 1990 or Stone et al. 2008.
PR motivation
PR checklist
- [ ] test suite needs to be run on this PR
- [ ] this PR will change answers in the test suite to more than roundoff level
- [ ] all newly-added functions have docstrings as per the coding conventions
- [ ] the
CHANGES
file has been updated, if appropriate - [ ] if appropriate, this change is described in the docs