Merge branch 'stefanozampini/matlmvm' into 'main'

some optimizations for MATLMVM

See merge request petsc/petsc!6034

Doc: Initial documentation for Plex periodicity.

Fix docs

Merge remote-tracking branch 'origin/release'

Merge branch 'barry/2023-01-31/fix-dmstagevecsplittodmda-periodic/release' into 'release'

improve DMSTAG manual pages

See merge request petsc/petsc!6016

improve DMSTAG manual pages

Commit-type: documentation
/spend 1.5h

Docs: fix extra spaces/ticks/missing parentheses

Fixup vec end-at docs

Make PetscErrorCode a non-discardable enum

Merge branch 'release'

Increase patchlevel to 3.18.4

update link to MUMPS website
Requested-by: chiara.puglisi@mumps-tech.com

Switch PetscFunctionList to store function pointers in a hashmap, improving lookup from O(n) to O(1)

Merge remote-tracking branch 'origin/release'

Merge branch 'jczhang/add-MatDenseGetArrayAndMemType' into 'main'

Add MatDenseGetArrayAndMemType and friends

Closes #1299

See merge request petsc/petsc!5956

Mat: add MatDenseGetArrayAndMemType and friends

Fix #1299

Modernize and clean up petscsys.h

- Deprecate PETSC_NULL.
- Switch from preprocessor defines to anonymous enums for constant expressions.
- Surround macro arguments in ().
- Remove redundant casts.

Modernize and clean up petscsys.h

- Deprecate PETSC_NULL.
- Switch from preprocessor defines to anonymous enums for constant expressions.
- Surround macro arguments in ().
- Remove redundant casts.
- Clean up overly complex preprocessor defines in various PetscMem*() functions.

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Bourdin/snesvi get variable bounds

Add previous meetings and links to them to the website

The older meeting files are rather large so they are kept in a seperate repository

Commit-type: community
/spend 2h

Merge branch 'jolivet/feature-hpddm-inertia-ci' into 'main'

PCHPDDM: add -pc_hpddm_levels_1_eps_use_inertia

See merge request petsc/petsc!5984

Print MPI_Comm and MPI_Win by casting them to PETSC_INTPTR_T since some MPI implementations use integers, while others use pointers

PCHPDDM: add -pc_hpddm_levels_1_eps_use_inertia

Merge branch 'barry/2022-12-27/rm-vecgetarray-fortran-examples' into 'main'

Replace use of VecGetArray() and friends from Fortran examples and docs

See merge request petsc/petsc!5950

Deprecate VecGetArray() and similar routines in favor of VecGetArrayF90() and similar routines, and update Docs

Commit-type: housekeeping
/spend 1h

Add MatMPIAIJGetSeqAIJF90(), MatMPIAIJRestoreSeqAIJF90()