Minor cleanup of GAMG code for main

VecNestSetSubVec(): reference the input vector rather than explicitly duplicating it

This is consistent with what is done in VecCreateNest()

Merge branch 'release'

Increase patchlevel to 3.21.2

Update web pages with meeting informations

Update sowing bfort for automatic generation of XXXDestroy() code

Fix some Fortran stub code to work with generation of XXXDestroy()

Add some runtime tests for XXXCreate() calls

Also update sowing

Update sowing bfort for automatic generation of XXXDestroy() code

Fix some Fortran stub code to work with generation of XXXDestroy()

Add some runtime tests for XXXCreate() calls

Also update sowing and fortranimpl.h to use PETSC_NULLPTR instead of NULL

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Add useful lists of options for GAMG and fieldsplit. Improve related manpages

Plex: Fix boundary integrals
- PetscFEIntegrateBd() now initializes its integrand
- Fix many multifield bugs in this routine

Plex: Allow a width for extruded cohesive cells

SNES: update manual on calling order for residual and Jacobian

Vec: make lock available in optimized mode

Having the lock available is important to take runtime decisions
on how to export the vector data in python

VecISXXX: require same communicator between Vecs and IS

this allows to skip operations if the global size of the IS is zero

DM: Add interface to query length of a sequence in HDF5

Plex: Fix refinement of cylinder mesh

DM+Plex: Now we can register different geometric models for mesh refinement
- Add a registration list for geometry model functions
- Add DM method snaptogeommodel

Merge branch 'knepley/feature-plex-trcohesive-3d' into 'main'

Plex: Add 3D cohesive transformations

See merge request petsc/petsc!7493

Merge remote-tracking branch 'origin/release'

Merge branch 'barry/2024-04-28/docs-ownershiprange/release' into 'release'

Add more details on Vec/MatGetOwnershipRange() and how the values are determined.

See merge request petsc/petsc!7512

Add more details on Vec/MatGetOwnershipRange() and how the values are determined.

Reported-by: Sayan Bhattacharjee

Bib: Added ref

Improve detection of manual page usage in example tutorials

Reported-by: Pierre Jolivet

Fix building distribution tarball

* Add wheel as a requirement, it is needed for running `setup.py`.
* Update exclude location for petsc4py.egg-info directory.
* Add `set -e` to builddist script to

Fix building distribution tarball

* Add wheel as a requirement, it is needed for running `setup.py`.
* Update exclude location for petsc4py.egg-info directory.
* Add `set -e` to builddist script to prevent errors going unnoticed.

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Merge branch 'hsuh/lmvm-dense-recursive' into 'main'

Recursive implementation for MatMult_LMVMDBFGS and MatSolve_LMVMDDFP

See merge request petsc/petsc!7472

Added documentation for dense LMVM implementation

Added Hansol's name for manual