fluids: Add QDataGet functions

Merge pull request #1568 from CEED/jrwrigh/fix_blasius_state

fix: Correct P0 deprecation

Merge pull request #1567 from CEED/jrwrigh/refactor_setuplibceed

fluids: Refactor primary Ceed Object creation routines

fluids: Introduce -idl_pressure option

Also re-instates the old P0 behavior with regard to the idl_pressure

fluids: Remove op_*_vol from user struct

And some other misc style changes

fluids: Consolidate QF and Op creation for BCs

fluids: Consolidate QF and Op creation blocks

Merge pull request #1562 from CEED/jrwrigh/fluids_problem_pointer

fluids: Make ProblemData a pointer to struct

fluids: Make ProblemData a pointer to struct

We basically use it as a pointer-to-struct type everywhere, so might as
well make it consistent with everything else

Merge pull request #1559 from CEED/jrwrigh/fix_memory_leaks

fix(fluids): Fix primary PETSc memory leak, others

fix(fluids): Fix primary PETSc memory leak, others

All the memory leaks reported in regression tests via `-malloc_dump`
are now related to the boundary conditions and their handling of
QFunctionCont

fix(fluids): Fix primary PETSc memory leak, others

All the memory leaks reported in regression tests via `-malloc_dump`
are now related to the boundary conditions and their handling of
QFunctionContexts, which is a much more difficult problem and will be
addressed later.

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Merge pull request #1557 from CEED/jrwrigh/diffusion_advection

fluids: Add diffusion to advection problem

test(fluids): Test diffusion in advection

Merge pull request #1553 from CEED/jrwrigh/ns_stabilized_mass

fluids: Add stabilized mass operator for Newtonian

test(fluids): Test newtonian stabilized mass

Merge pull request #1543 from CEED/jrwrigh/explicit_stabilized_mass

Fluids: Add stabilized mass operator for advection problem

test(fluids): Add test for advection stabilized mass

ie. SUPG

fluids: Add stabilized mass for advection

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

Merge pull request #1539 from CEED/jrwrigh/explicit_ns

fluids: Make Newtonian BCs compatible with explicit timestepping, add test

test(fluids): Add explicit NS test

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

Use #pragma once for non-JiT headers

minor - update copyright headers

Merge pull request #1515 from lindsayad/fix-int-types

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