doc: fix math in headers

There is a bad hyperref/unicode-math interaction apparently resulting
from how PDF bookmarks work. This replaces math in headers (section
titles) with unicode Greek letters

doc: fix math in headers

There is a bad hyperref/unicode-math interaction apparently resulting
from how PDF bookmarks work. This replaces math in headers (section
titles) with unicode Greek letters to fix doc-latexpdf.

https://tex.stackexchange.com/questions/570000/improper-alphabetic-constant-error-in-title-with-greek-bug-with-unicode-math-an

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DiffFilterFields: Move to separate fields for diff filter

- This will allow easier access to the filtered state for later
processing

DiffFilterFields: Make diff_filter operators compatible with fields

DiffFilterField: Reshuffling of DM Creation passes tests

fluids: Specify dm_field in GetRestrictionForDomain

refactor(fluids): Make j, k consisitent

When doing double for loops, `j` should be components and `k` should be
coordinate direction, such that Grad_v[k][j][i] indexes the gradient
array coming from

refactor(fluids): Make j, k consisitent

When doing double for loops, `j` should be components and `k` should be
coordinate direction, such that Grad_v[k][j][i] indexes the gradient
array coming from libCEED

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doc(fluids): Add differential filtering

fluids: Add MMS test for differential filtering

MMS = method of manufactured solutions

fluids: Add anisotropic filtering test with damping

fluids: Add wall-damping to differential filter

fluids: Add isotropic filtering test

fluids: Add differential filtering setup

fluids: Add differential filtering QFs

fluids: Add grid_aniso collocated vector function

test(fluids): Error if there are unused options

- Protects against flag name changes which may cause a test to not run,
but pass the test (as it wouldn't output any error)

fluids: Blasius IC for primitive variables

fluids: Move to state enum for state functions

style(fluids): Misc typo fixes

- Clean up blasius.yaml
- Typo fix to data-driven SGS setup
- Remove unneccessary CeedVector from SGS DD setup
- Fix STG error message to be more general

refactor(fluids): Refactor CreateMassQFunction

fix(fluids): FormSetValues respect pbdiagonal argument

- This would allow for the preconditioner to be an assembled pbdiagonal
matrix, but the Jacobian to be a full AIJ matrix.

fluids: Rename user->M --> M_inv

fluids: Move RHSFunction to petsc-ops

fluids: OperatorApplyContextCreate verify all sizes

fluids: Define in/out in docstring params

refactor(fluids): STG setup functions refactored