Add shared memory support for PCMPI using both shmget() and MPI_Win_allocate_shared()

Add convinience routines PetscObjectContainerCompose() and PetscObjectContainerQuery

Deprecate PETSC_DEFAULT for Tao parameters with PETSC_CURRENT and add support for PETSC_DETEREMINE to use default

Update SNESSetTolerances() to accept PETSC_DETERMINE an PETSC_DECIDE

Deprecate the use of PETSC_DEFAULT with PETSC_CURRENT for KSPSetTolerances() since PETSC_DEFAULT is a confusing (and wrong) term in current usage.

Add support to KSPSetTolerances() to accept PETSC_D

Deprecate the use of PETSC_DEFAULT with PETSC_CURRENT for KSPSetTolerances() since PETSC_DEFAULT is a confusing (and wrong) term in current usage.

Add support to KSPSetTolerances() to accept PETSC_DETERMINE to reset the value back to the default when the object was created

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Plex: Made DMPlexCreateCellNumbering() public

DMAdaptor: Fix multiple adaptations - Fix prefixes - Add DMAdaptorSetOptionsPrefix()

Merge branch 'nathawani/feature-amr-using-flux-norm' into 'main'

SNES ex27: Poisson problem using primal and mixed form for error estimator using flux norm

See merge request petsc/petsc!7674

DMAdaptor: Add monitoring
- Add DMAdaptorMonitor(), DMAdaptorMonitorSet(), DMAdaptorMonitorCancel(), DMAdaptorMonitorSetFromOptions()
- Add DMAdaptorMonitorError(), DMAdaptorMonitorErrorDraw(), DMA

DMAdaptor: Add monitoring
- Add DMAdaptorMonitor(), DMAdaptorMonitorSet(), DMAdaptorMonitorCancel(), DMAdaptorMonitorSetFromOptions()
- Add DMAdaptorMonitorError(), DMAdaptorMonitorErrorDraw(), DMAdaptorMonitorErrorDrawLGCreate(), DMAdaptorMonitorErrorDrawLG()
- Add DMAdaptorMonitorRegister(), DMAdaptorMonitorRegisterAll(), DMAdaptorMonitorRegisterDestroy()

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DMAdaptor: Complete overhaul
- Add CLASSID and type registration
- Add error estimates based upon a mixed problem
- Add DMAdaptorSetType(), DMAdaptorGetType(), DMAdaptorRegister(), DMAdaptorRegisterA

DMAdaptor: Complete overhaul
- Add CLASSID and type registration
- Add error estimates based upon a mixed problem
- Add DMAdaptorSetType(), DMAdaptorGetType(), DMAdaptorRegister(), DMAdaptorRegisterAll(), DMAdaptorRegisterDestroy()
- Add DMAdaptorGetMixedSetupFunction() and DMAdaptorSetMixedSetupFunction()

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Plex: Add DMPlexComputeL2FluxDiffVec() and DMPlexComputeL2FluxDiffVecLocal()

Merge branch 'jolivet/feature-fieldsplit-reuse-solve' into 'main'

PCFIELDSPLIT: reuse computation of Schur complement in PCApply()

Closes #1554

See merge request petsc/petsc!7684

PetscDS: Add cell volume to constants and set during integration - Add PetscDSSetCellParameters()

PCFIELDSPLIT: reuse computation of Schur complement in PCApply()

The use case of PetscOptionsGetViewer() has evolved to no longer be the get/restore model

Hence the code needs to be refactored

Introduce PetscCallNull() and PetscCallMPINull() to simplify PETSC_VI

The use case of PetscOptionsGetViewer() has evolved to no longer be the get/restore model

Hence the code needs to be refactored

Introduce PetscCallNull() and PetscCallMPINull() to simplify PETSC_VIEWER_XXXX_() routines

Reported-by: James Wright
Thanks-to: Jeremy L Thompson

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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>

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

Reported-by: Stefano Zampini

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

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

Plex: Add edge numbering

See merge request petsc/petsc!7595

Plex: Add edge numbering

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()

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

Plex: Allow a width for extruded cohesive cells