fluids: Report both amat and pmat types

Merge pull request #1478 from CEED/jrwrigh/velo_grad_util

fluids: Use utility for velocity gradient projection

fluids: Use utility for velocity gradient projection

- Evidentily missed this one when I added
StatePhysicalGradientFromReference awhile back. Or this was on a
longer lived branch that got me

fluids: Use utility for velocity gradient projection

- Evidentily missed this one when I added
StatePhysicalGradientFromReference awhile back. Or this was on a
longer lived branch that got merged out-of-order

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docs(fluids): Document changes to 2D/3D advection

fluids: Merge 2D and 3D advection setup

Instead of `-problem advection` and `-problem advection2d`, there's just
`-problem advection` and the dimensionality is taken from the dm.

fluids: Generalize advection boundary qfunctions

fluids: Packing routines for 2D boundary setup

fluids: Generalize advection RHSFunction for 2d and 3d

fluids: Convert strong_form to boolean in advection

docs(fluids): Combine 2D and 3D documentation

fluids: Generalize advection IFunction for 2d and 3d

fluids: Change 2D qdata to use unpacking routines

fluids: Generalize advection IC for 2d and 3d

fluids: Create generic MatMatN for square matrices

MatMat3 now uses MatMatN

Merge pull request #1446 from CEED/jrwrigh/advection_refactor

fluids: Misc refactor/updates for advection and stabilization

fluids: Convert IFunction_Advection to state structs

fluids: Minor stabilization refactor

fluids: Change skew advection threshold

3rd order requires a 20 CEED_EPSILON instead of just 5

fluids: Refactor diagonal tau calculation

Also correct documentation of tau calculation

fluids: Cleanup misc math

Merge pull request #1452 from CEED/jrwrigh/stats_overwrite

fluids: Stats don't overwrite solution on first-step failure

fluids: Stats don't overwrite solution on first-step failure

- When you have an initial condition from a previous problem, it might
fail on the first step. This will cause `reason != TS_CONVERGED_

fluids: Stats don't overwrite solution on first-step failure

- When you have an initial condition from a previous problem, it might
fail on the first step. This will cause `reason != TS_CONVERGED_ITERATING`
and thus it will continue on with the rest of the TSMonitor routine.
If you have a stats file from that initial condition, it will be
overwritten.

Regardless of the overwriting behavior, it *never* makes sense to
write out a stats file on the first step; Using left-rectangle rule
for the time averaging integration, the initial step should *never* be
used, thus there is nothing to collect or write.

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Merge pull request #1445 from CEED/jrwrigh/cosine_hill

fluids: Add cosine hill and skewed advection initial conditions

test(fluids): Advection skew initial condition

test(fluids): Advection cosine