Merge pull request #1088 from CEED/jrwrigh/stg_fluctuating_IC

fluids: Add option for STG fluctuations in initial condition

fluids: Prevent Chebyshev calc if using STG

fluids: Style, refactor to PetscCall, etc.

fluids: Add STG fluctuations to initial condition

- Extrudes the STG fluctuations downstream of the inflow (using the STG
method's inherent dependence on streamwise distance)

Got the correct order of accuracy for bp3/bp4

delete bcfunctions.c and some cleanup

Compute L2 Error like ratel

Added SetupContext for apply and error operators

Added SETERRQ to break for BP5/6 + simplex

Update dXdx, Added bp_data to CreateBasisFromPlex

refactored CreateBasisFromPlex like ratel

Created label like ratel, added DMViewFromOptions

Fixed the uncompatible restriction size.

Added TESTARGS for simplex in bps.c and multigrid.c

used "PC_JACOBI_DIAGONAL" to work for tet element

Used "CeedOperatorMultigridLevelCreate" to create multigrid operators

example/petsc: Added CreateDistributedDM in petscutils.c and some cleanup

example/petsc: added CreateBasisFromPlex and tested with tensor basis

fluids: Integrate freestream bc

fluids: Add SetupBCQFunctions to setuplibceed.c

- Condenses redundant code into a single function. Will be useful when
implementing the freestream bc

fluids: Create AddBCSubOperator in setuplibceed.c

- Condenses redundant code (and will help reduce redundancy when I add
in the freestream boundary conditions as well).

fluids: Create freestream bc qfunction

style(fluids): Visual cleanup of the fluids code

Also satisfy astyle for RiemannFlux_HLL commit

fluids: Add RiemannFlux_HLL helper function

Co-authored-by: Jed Brown <jed@jedbrown.org>

Merge pull request #1075 from CEED/jeremy/small-bps-fix

petsc - drop VecZero in diag assembly