fluids: Catch if no options passed

fluids: Fix docstring

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

Merge pull request #1516 from CEED/jrwrigh/fix_fluids_64

fluids: Fix issues with 64 bit PetscInt builds

fluids: Fix issues with 64 bit PetscInt builds

Avoid integer conversion warnings for fields in SgsDDData

Edit sample command lines for fluid example

Don't give sample that yields non-zero exit code

Merge pull request #1510 from CEED/jrwrigh/fluids_matceed

fluids: Add MatCeed

fluids(MatCeed): PetscCeedCall -> PetscCallCeed

fluids: Add -pmat_pbdiagonal warning

fluids: Remove old CreateMatShell_Ceed

This is fully replaced by MatCeed

fluids: Add KSPSetFromOptions_WithMatCeed

fluids: Use MatCeed for Jacobian

test(fluids): Add stabilized explicit test for advection

Also uses consistent mass matrix

fix(fluids): RHS stabilization term should be negative

fluids: Add MatCeed Code from Ratel

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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fixup! fluids: Change test for advection tau types

doc(fluids): New choices for tau in advection

fluids: Change test for advection tau types

fluids: Add different tau choices for advection

test(fluids): Test bc_slip

fluids: Implement bc_slip

This is a weak version of slip boundary condition based on a Riemann
solve

fluids: Change -bc_slip_x -> -bc_symmetry_x

Merge pull request #1361 from CEED/jrwrigh/external_sgs

fluids: Add external SGS DD inference capability