Clearify meaning of "Changes" in docs and mention use of deprecation so users can sometimes use deprecated APIs

Commit-type: documentation
\spend 5m

Put manual, manual pages, indices, and changes also in website Overview page

Commit-type: documentation
\spend 5m

In directions for building docs with Python virtual environment, provide information about how to turn off the virtual environment

Without this information I was having to reboot my machine to use P

In directions for building docs with Python virtual environment, provide information about how to turn off the virtual environment

Without this information I was having to reboot my machine to use Python in a normal way each time after I built the docs

Commit-type: documentation
\spend 10m
Thanks-to: Patrick Sanan

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Merge branch 'jiao/ksp-qmrcgstab' into 'main'

KSP: Added qmrcgstab with right preconditioning

See merge request petsc/petsc!4157

KSP: Added qmrcgstab with right preconditioning

Merge remote-tracking branch 'origin/release'

Stash communicators previously used for external packages so that they may be reused.

Previously we used MPI_Comm_dup() and free() but for some MPI implementations including MPI Spectrum the MPI_Com

Stash communicators previously used for external packages so that they may be reused.

Previously we used MPI_Comm_dup() and free() but for some MPI implementations including MPI Spectrum the MPI_Comm_free() does not actually return the communicator so eventually they run out.

Commit-type: portability-fix
\spend 3h
Reported-by: Elias Karabelas <elias.karabelas@uni-graz.at>

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Merge branch 'jczhang/feature-mpi-large-count' into 'main'

SF: add MPI large count support

See merge request petsc/petsc!4673

Merge branch 'gbetrie/fix-dmnetworkaddcomponent' into 'main'

Gbetrie/fix dmnetworkaddcomponent

See merge request petsc/petsc!4658

Adding/modify tests on zero size components to several examples;
DMNetworkAddComponent(): the owning rank and all ghost ranks must call it to add a component and nvar in the same order
Update doc for

Adding/modify tests on zero size components to several examples;
DMNetworkAddComponent(): the owning rank and all ghost ranks must call it to add a component and nvar in the same order
Update doc for DMNetworkAddComponent
merge DMNetworkLayoutSetUp_Coupling() into DMNetworkLayoutSetUp() to remove duplication

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Merge branch 'psanan-release-patch-13423' into 'release'

Docs: Developer's guide: Fix formatting of tests' associated data

See merge request petsc/petsc!4711

SF: support mpi large count in SFBasic/SFNeighbor

Merge remote-tracking branch 'origin/release'

Docs: Developer's guide: Fix formatting of tests' associated data

Docs: Dev manual testing chapter: fix formatting error

Merge branch 'knepley/feature-plex-multiple-hybrid' into 'main'

DM+FE: Allow multiple cohesive fields

See merge request petsc/petsc!4616

DM+FE: Allow multiple cohesive fields
- Changed name from "hybrid" cell to "cohesive" cell
- Fixed check for cohesive field in PetscFE and DM
- Fixed DMCreateDS() for new scheme
- Added PetscDSIsCohe

DM+FE: Allow multiple cohesive fields
- Changed name from "hybrid" cell to "cohesive" cell
- Fixed check for cohesive field in PetscFE and DM
- Fixed DMCreateDS() for new scheme
- Added PetscDSIsCohesive() and PetscDSGetNumCohesive()
- Replaced PetscDSGetHybrid() with PetscDSGetCohesive() and
PetscDSSetHybrid() with PetscDSSetCohesive()
- Added PetscDSGetFieldOffsetCohesive()
- Fixed hybrid Jacobian integration
- Hybrid Jacobian integration needs to know the side of the interface, just like residual integration
- Needs to use cohesive field offsets
- Update takes the side as an argument

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Change HAVE_MKL to HAVE_MKL_LIBS and Add HAVE_MKL_INCLUDES

Merge branch 'release'

Increase patchlevel to 3.16.3

Add ISGeneralSetIndicesFromMask().

Add arg validation to ISGeneralSetIndices().

Merge branch 'stefanozampini/petsc4py' into 'main'

Some work on petsc4py

See merge request petsc/petsc!4644

MATIS: fix what NULL means for l2gmap

conceptually, a NULL l2map is a full local to global map
petsc4py: support for MatCreateIS and add MATIS tests

Merge remote-tracking branch 'origin/release'

Update doc/petsc.bib