Track levels of nesting of KSP, for example KSPBJACOBI has nesting 1 higher than the calling KSP

fix bugs in testharness that effect using it for other packages and document how to use it

Add specific vertex viewing for DMNetwork -- zoom in on selected vertices

Rename VecChop() into VecFilter()

Rename MatChop() into MatFilter()

Change log fixes

Add PetscAssertPointer to change log

Rename PetscValidPointer -> PetscAssertPointer

Deploy new PetscValidPointer, remove PetscValidXXXPointer

Merge remote-tracking branch 'origin/release'

petsc4py: Pin Cython 0.29.36

Merge branch 'jczhang/2023-07-18/feature-vecmaxpby' into 'main'

Add VecMAXPBY()

See merge request petsc/petsc!6733

MatEliminateZeros(): add [S]BAIJ implementations

MatEliminateZeros(): skip zero nondiagonal coefficients

Expose MatComputeVariableBlockEnvelope() in public headers

TS: add infrastructure to support time-dependent problems with varying size

Vec: add VecMAXPBY()

matrix free in docs and comments should be matrix-free

Merge branch 'jolivet/fix-wrong-api' into 'main'

Docs: no such a thing as MatSetOptions()

See merge request petsc/petsc!6713

Merge remote-tracking branch 'origin/release'

Try: require = 'Cython == 0.29.36'

As petsc4py has build errors with cython-0.30.0

Docs: no such a thing as MatSetOptions()

Cleanup of c2html build in docs

Commit-type: docs-only

Convert generation of manual page links to implementations to python

Commit-type: docs-only, performance

Refactor, cleanup, speedup fix_man_page_edit_links.py

Improve the timings of parts of make docs

Commit-type: docs-only