Clean the Trapping variable names,

[Jacob-Stevens-Haas]

Most significant changes are:

• Clarifying the threshold-0 optimization step shape and terms
• Making the final optimization step generic, i.e. (_equality_constrained_linlsq())
• Minimizing H0tilde instead of H0
• Refactoring out permutation asymmetry (_permutation_asymmetry()), conversion of Q to enstrophy basis (_convert_quad_terms_to_ens_basis()), and creating As (_create_A_symm())
• Carrying around enstrophy matrix and it's root in the EnstrophyMat class (simplifies parameter signatures without relying on methods)

Most of these changes improve the testability of the code, although tests are not written for all of them (yet?). Furthermore, _solve_m_relax_and_split() needs work, but may need to be changed

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.30%. Comparing base (137b19d) to head (7893d43). Report is 16 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #553 +/- ## ========================================== + Coverage 94.64% 95.30% +0.65% ========================================== Files 37 37 Lines 4018 4046 +28 ========================================== + Hits 3803 3856 +53 + Misses 215 190 -25 ```

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