fluids: Demo MatCeed{Get,Set}ContextReal

fluids: Use new MatCeed/Ratel updates

Merge pull request #1543 from CEED/jrwrigh/explicit_stabilized_mass

Fluids: Add stabilized mass operator for advection problem

fluids: Add stabilized mass for advection

This enables "full" SUPG for the advection problem using explicit time
integrators

Merge pull request #1537 from CEED/jeremy/pragma-once

Use #pragma once for non-JiT headers

minor - update copyright headers

Merge pull request #1517 from CEED/jrwrigh/ratel_sync

fluids: Sync with Ratel changes

fluids: Sync with Ratel, get ceed-utils.h

Merge pull request #1510 from CEED/jrwrigh/fluids_matceed

fluids: Add MatCeed

fluids: Add KSPSetFromOptions_WithMatCeed

fluids: Use MatCeed for Jacobian

fluids: Make MatShell functions static

This is done primarily to allow MatCeed to coexist with the context
operators for right now.

This has the nasty side-effect of forcing `Mat` objects to be NUL

fluids: Make MatShell functions static

This is done primarily to allow MatCeed to coexist with the context
operators for right now.

This has the nasty side-effect of forcing `Mat` objects to be NULL when
they're passed into CreateMatShell_Ceed, but that will soon be replaced
with MatCeed, so it is only temporary for the transition in this PR

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Merge pull request #1361 from CEED/jrwrigh/external_sgs

fluids: Add external SGS DD inference capability

Merge pull request #1496 from CEED/jrwrigh/ksp_mass

Fluids: Fix mass operator for explicit timestepping, move to KSP for mass operator

fixup! fluids: Use KSP for explicit mass matrix

fluids: Fix mass matrix for explicit time stepping

The local vector should be initialized to zero so that all the essential
nodes (ie. strong boundary condition nodes) are not factored in for the
ma

fluids: Fix mass matrix for explicit time stepping

The local vector should be initialized to zero so that all the essential
nodes (ie. strong boundary condition nodes) are not factored in for the
matrix multiply. The PR associated with this commit should have a
document attached detailing why this is the case.

Previous tests used this incorrect mass matrix and so now fail. The
results for these tests are corrected as well.

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fluids: Use KSP for explicit mass matrix

fluids: Refactor function names

- PascalCase for acronyms longer than 2 letters
- Remove the "Anisotropic" qualifier from function names, as we only
have one data-driven SGS model. If we add an is

fluids: Refactor function names

- PascalCase for acronyms longer than 2 letters
- Remove the "Anisotropic" qualifier from function names, as we only
have one data-driven SGS model. If we add an isotropic model later, we
can give that the "Isotropic" qualifier on it's function names
- Remove the "Model" qualifier from function names. "SgsDD" is
communicative enough (Subgrid-stress inherently means a model)

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Merge pull request #1203 from CEED/jrwrigh/smartsim

fluids: SmartSim Online Data-Driven SGS training

fluids: Add -sgs_train_enable flag

fluids: Add TSPostStep for SGS DD Training

- This will shutdown the simulation if there's a tensor called
`check-run` equal to zeros

fluids: Don't set ts_max_steps if not TESTTYPE_NONE

Merge pull request #1349 from CEED/jrwrigh/remove_ctx_update

fluids: Use normal `CeedOperatorSetContextDouble` instead of `UpdateContextLabel`

fluids: Use normal CeedOperatorSetContextDouble

That instead of `UpdateContextLabel`, as #1347 built that functionality
into the normal label setting functions themselves

Merge pull request #1233 from CEED/jrwrigh/pbdiagonal_symbolic

Add CeedOperatorLinearAssemblePointBlockDiagonalSymbolic