Fix -Wunused-but-set-variable

src/dm/dt/fe/interface/fe.c:2420:41: warning: variable ‘g’ set but not used [-Wunused-but-set-variable=]
2420 | PetscInt dOffset = 0, fOffset = 0, f, g;
|

Fix -Wunused-but-set-variable

src/dm/dt/fe/interface/fe.c:2420:41: warning: variable ‘g’ set but not used [-Wunused-but-set-variable=]
2420 | PetscInt dOffset = 0, fOffset = 0, f, g;
| ^
src/dm/field/impls/da/dmfieldda.c:31:17: warning: variable ‘c’ set but not used [-Wunused-but-set-variable=]
31 | PetscInt i, c, dim;
| ^
src/dm/impls/plex/plex.c:8007:28: warning: variable ‘newP’ set but not used [-Wunused-but-set-variable=]
8007 | for (PetscInt p = 0, newP = 0, o = fStart, oNew = fNewStart; p < numPoints; p++) {
| ^~~~
src/ts/utils/dmplexlandau/plexland.c:351:39: warning: variable ‘loc_fdf_idx’ set but not used [-Wunused-but-set-variable=]
351 | for (PetscInt ei_r = 0, loc_fdf_idx = 0; ei_r < numCells[grid_r]; ++ei_r) {
| ^~~~~~~~~~~

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Remove more unneeded braces

Remove unnecessary braces around one-liners

git grep -lE "[ ]*(if|for|while) \(.*\) {[^;]*;[^;]*}$" -- '*.c' '*.cxx' '*.cu' '*.h' '*.hpp' '*.cpp' | xargs sed -i '' -E 's#([ ]*)(if|for|while) \((.*)\

Remove unnecessary braces around one-liners

git grep -lE "[ ]*(if|for|while) \(.*\) {[^;]*;[^;]*}$" -- '*.c' '*.cxx' '*.cu' '*.h' '*.hpp' '*.cpp' | xargs sed -i '' -E 's#([ ]*)(if|for|while) \((.*)\) {([^;]*);([^;]*)}$#\1\2 \(\3\)\4;\5#'

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missing "s" for isascii and issundials

Merge branch 'knepley/feature-lumped-quadrature' into 'main'

DT+FE: Add quadrature for diagonal mass matrices

See merge request petsc/petsc!8584

DT+FE: Add quadrature for diagonal mass matrices
- More work to do here
- Add PetscDTCreateQuadratureByCell()
- Allow quadrature type to be set from options

FE: Changed signature of PetscFEIntegrateJacobian() to allow rectangular operators