Merge branch 'barry/2024-06-28/fix-improve-blas-openmp' into 'main'

Fix handling of initialization of number of BLAS threads.

See merge request petsc/petsc!7658

Add OpenMP directive to MatMult_SeqAIJ etc

Gives pretty good speedup on good memory-bandwidth Intel system and M2 Mac

Reported-by: Yongzhong Li <yongzhong.li@mail.utoronto.ca>

Merge branch 'barry/2024-07-01/improve-docs-cflags/release' into 'main'

Add support for CFLAGS+=flags and friends

See merge request petsc/petsc!7662

Merge remote-tracking branch 'origin/release'

Refactor VecSetInf() into VecFlag() and deprecate VecSetInf()

Reported-by: Stefano Zampini

Merge branch 'stefanozampini/ts-fixes' into 'release'

Fix multilevel TS error when using IFunction + RHSFunction

See merge request petsc/petsc!7656

Add support for CFLAGS+=flags and friends

Merge branch 'barry/2024-06-14/fix-fortransnessetjacobianmatfdcoloring' into 'main'

Need to add SNESSetJacobian() Fortran interface to handle case when...

See merge request petsc/petsc!7631

Improve the Fortran handling of functions that take ctx with type(*) support

Reported-by: Adrian Croucher <a.croucher@auckland.ac.nz>

Merge branch 'release'

Increase patchlevel to 3.21.3

TS: document expected failure of multilevel solvers

when IJacobian and RHSJacobian are both used with a fully implicit solver

Merge remote-tracking branch 'origin/release'

Docs: fix typos and extra characters

Merge remote-tracking branch 'origin/release'

Fix the monitoring of PetscOptionsClearValue.

Co-authored-by: Barry Smith <bsmith@mcs.anl.gov>
Co-authored-by: Stefano Zampini <stefano.zampini@gmail.com>

This requires some changes to user FORTRAN code

Pass PETSC_NULL_XXX_ARRAY when passing a NULL as an argument that is expecting an array
Pass PETSC_NULL_ENUM when argument returns an enum instead of

This requires some changes to user FORTRAN code

Pass PETSC_NULL_XXX_ARRAY when passing a NULL as an argument that is expecting an array
Pass PETSC_NULL_ENUM when argument returns an enum instead of PETSC_NULL_INTEGER
Pass arrays (and not scalar values) when the argument is expecting an array; this means replace, for example, the argument v with [v]
Use PetscObjectIsNull(obj) to check if the object is NULL, instead of obj == PETSC_NULL_XXX

The compiler will now automatically prevent you from using the wrong argument type for the first three bullets above
This will also require an update sowing with the new sowing branch this MR is using.

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Merge remote-tracking branch 'origin/release'

Docs: fix missing Fortran examples

Merge remote-tracking branch 'origin/release'

Demonstrate approximate Benzi preconditioner for grad-div perturbations to the velocity block of Navier-Stokes

Merge branch 'stefanozampini/fix-dirk-dae-restart' into 'release'

Guarantee that SNES function is called before SNES jacobian in multilevel solvers

See merge request petsc/petsc!7563

Merge branch 'knepley/feature-plex-edge-numbering' into 'main'

Plex: Add edge numbering

See merge request petsc/petsc!7595

Bib: Added refs

Plex: Add edge numbering