Fix warnings

DMClone: copy prealloc_skip like prealloc_only

DMSetMatrixPreallocateOnly is similar to DMSetMatrixPreallocateSkip and
should be passed along to clones, especially so that
-dm_mat_preallocate_skip i

DMClone: copy prealloc_skip like prealloc_only

DMSetMatrixPreallocateOnly is similar to DMSetMatrixPreallocateSkip and
should be passed along to clones, especially so that
-dm_mat_preallocate_skip is received by clones (which usually don't
themselves call DMSetFromOptions).

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DMGetWorkArray: avoid MPI_Type_size for most used datatypes

DMPlexGetRawFaces_Internal: optimize DMGetWorkArray calls

DMPlex: add DMPlexUninterp event

This operation is often expensive (even dominating total cost) so needs
to be profiled.

KSPCHEBYSHEV: need to call skip set from options for the PC

Merge remote-tracking branch 'origin/release'

change to consistent use of ch_xxx for chapter names in the docs, instead of a mix of ch_xx and chapter_xx

Merge remote-tracking branch 'origin/release'

Fix trivial typos etc in some manual pages

Also remove manual page for SNESNGSFunction since it does not exist

Merge remote-tracking branch 'origin/release'

Plex: More FPE fixes

allow cells with no coordinates
FVM: More robust limiter
PetscGridHash: use Calloc to avoid floating point exceptions
PetscDT: fpe fixes

Fix typos

Merge remote-tracking branch 'origin/release'

Fix PetscCallMPI(MPI_Allreduce()) with PETSc types

Merge remote-tracking branch 'origin/release'

Fix documentation

Merge remote-tracking branch 'origin/release'

Some updates to users guide focusing on the discretization infrastructure

Merge remote-tracking branch 'origin/release'

Merge branch 'barry/2023-03-30/fix-include-man-pages/release' into 'release'

Fix manual pages in include files

See merge request petsc/petsc!6272

Fix manual pages in include files

Format the ftn-custom files with clang-format. Apparently no particular reason we did not format them initially