Merge branch 'barry/2023-11-21/fix-thread-safety-petscoptionsgetviewer' into 'main'

Fix PetscOptionsGetViewer() so it works in a thread-safe way

See merge request petsc/petsc!7047

Fix PetscOptionsGetViewer() so it works in a thread-safe way

When PetscOptionsGetViewer() returns, for example, PETSC_VIEWER_STDOUT_SELF the same object is shared
by all threads that call PetscOptio

Fix PetscOptionsGetViewer() so it works in a thread-safe way

When PetscOptionsGetViewer() returns, for example, PETSC_VIEWER_STDOUT_SELF the same object is shared
by all threads that call PetscOptionsGetViewer(). In the previous code PetscObjectReference() and
dereference (via PetscViewerDestroy() where called on the viewer by multiple threads after the viewer
was accessed thus corrupting the object.

This branch introduces a PetscOptionsRestoreViewer() that allows not doing the referencing and dereferencing
on persistant viewers, thus removing the specific race condition above.

Other possible solutions include

Use a lock on each PetscObjectReference/Dereference() just in case they are shared. Could be time consuming so one
could mark each object as either threadshared or independent and only do the locks on threadshared objects. This lowers
the cost but would require more extensive changes to PETSc infrastructure. And I do not know if this shared/not shared model
is what we need in the long run, though it might be.

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Merge remote-tracking branch 'origin/release'

Merge branch 'barry/2023-11-24/fix-ksp-manpages/release' into 'release'

Fix manual pages in KSP

See merge request petsc/petsc!7055

Fix manual pages in KSP

Merge remote-tracking branch 'origin/release'

Merge branch 'barry/2023-11-01/docs-kspcomputeeigenvalues/release' into 'release'

Fix manual pages in ksp/interface files

See merge request petsc/petsc!6988

Fix manual pages in ksp/interface files

Merge branch 'jacobf/2023-08-09/linter-detect-static-function-candidates' into 'main'

Linter detect possible static functions

See merge request petsc/petsc!6796

Add static to internal functions

Merge branch 'barry/2023-07-18/manual-linter-fixes-ksp' into 'main'

Manual fixes needed for linter for the KSP directory

See merge request petsc/petsc!6735

Manual fixes needed for linter for the KSP directory

Merge branch 'barry/2023-06-16/pcmpi-simplify-options-database-api' into 'main'

Change the options database API for PCMPI to eliminate the -mpi_ options...

See merge request petsc/petsc!6611

Change the options database API for PCMPI to eliminate the -mpi_ options prefix; thus one can run -mpi_linear_solver_server -ksp_type cg -pc_type gamg to get the parallel version of these preconditio

Change the options database API for PCMPI to eliminate the -mpi_ options prefix; thus one can run -mpi_linear_solver_server -ksp_type cg -pc_type gamg to get the parallel version of these preconditioners.

Commit-type: usability

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Merge branch 'tisaac/feature-type-generic-petsc-valid-pointer' into 'main'

Implement a type generic PetscValidPointer

See merge request petsc/petsc!6693

Rename PetscValidPointer -> PetscAssertPointer

Deploy new PetscValidPointer, remove PetscValidXXXPointer

Merge branch 'jacobf/2023-06-30/enable-doc-lint' into 'main'

Enable docs linting

See merge request petsc/petsc!6667

Lint apply: ksp

Merge branch 'stefanozampini/pcsetup' into 'main'

do not call PCSetUp during applications

See merge request petsc/petsc!6636

Minor

KSPSetPC: must reset the setupstage if pc is different

Merge branch 'stefanozampini/ksp-view-final-residual-vec' into 'main'

KSP: view final residual vector

See merge request petsc/petsc!6604

KSP: view final residual vector

docs: additional chapter_ -> ch_ change in main after merge of release changes from !6520