Convert all header guards to pragma once

Merge branch 'jacobf/2023-08-18/undelete-some-mpisell-code' into 'main'

Undelete some mpisell code

See merge request petsc/petsc!6827

Undelete some mpisell code

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

Linter detect possible static functions

See merge request petsc/petsc!6796

Extern appriopriate symbols before the great en-static-ing

Merge branch 'jczhang/rename-a-var' into 'main'

Use a better name for matrix

See merge request petsc/petsc!6762

Use a better name for matrix

Merge branch 'barry/2023-07-15/add-mat-vec-createfromoptions' into 'main'

Add convenience functions VecCreateFromOptions() and MatCreateFromOptions() to...

See merge request petsc/petsc!6711

Add convenience functions VecCreateFromOptions() and MatCreateFromOptions() to reduce the use of specialize creation routines in the examples and thus make it easier for people to use GPU based solve

Add convenience functions VecCreateFromOptions() and MatCreateFromOptions() to reduce the use of specialize creation routines in the examples and thus make it easier for people to use GPU based solvers

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Merge branch 'jolivet/change-matchop-matfilter' into 'main'

Consolidate MatChop() and MatAIJFilter()

See merge request petsc/petsc!6699

Rename MatChop() into MatFilter()

Merge branch 'jolivet/feature-mateliminatezeros-sbaij' into 'main'

MatChop()/MatEliminateZeros() improvements and other minor fixes

See merge request petsc/petsc!6706

MatEliminateZeros(): skip zero nondiagonal coefficients

Expose MatComputeVariableBlockEnvelope() in public headers

Merge branch 'jacobf/2023-07-11/better-deprecated-macro' into 'main'

Feature: Uniform Deprecated Macro

See merge request petsc/petsc!6692

Apply new macros

Merge branch 'knepley/feature-mat-lrc-create' into 'main'

Mat: Now MatLRC registers a creation routine and responds like a regular Mat type

See merge request petsc/petsc!6640

Mat: Now MatLRC registers a creation routine and responds like a regular Mat type

Co-Authored-by: Jose E. Roman <jroman@dsic.upv.es>

Merge remote-tracking branch 'origin/release'

Merge branch 'barry/2023-05-27/improve-tutorials/release' into 'release'

Minor cleanup of website tutorials

See merge request petsc/petsc!6520

Merge branch 'tisaac/feature-mat-vectordiagonal' into 'main'

Add MATDIAGONAL and PCMatSetApplyOperation()

See merge request petsc/petsc!6487

change to consistent use of ch_xxx for chapter names in the docs, instead of a mix of ch_xx and chapter_xx

Add `MATDIAGONAL` and `PCMatSetApplyOperation()`

`MATDIAGONAL` (`MatCreateDiagonal()`) is an interface for
manipulating a diagonal matrix as a `Vec`, in particular supporting
no-copy modification of

Add `MATDIAGONAL` and `PCMatSetApplyOperation()`

`MATDIAGONAL` (`MatCreateDiagonal()`) is an interface for
manipulating a diagonal matrix as a `Vec`, in particular supporting
no-copy modification of the diagonal and inverse diagonal via
`MatDiagonalGetDiagonal()`, `MatDiagonalRestoreDiagonal()`,
`MatDiagonalGetInverseDiagonal()`, and
`MatDiagonalRestoreInverseDiagonal`().

`PCMatSetApplyOperation()` and `PCMatGetApplyOperation()`
support using all the linear operators currently defined by a `Mat`
(`MatMult()`, `MatMultTranspose()`, `MatMultHermitianTranspose()`,
`MatSolve()`, `MatSolveTranspose()`) as the operation of `PCApply()`
for a `PCMAT`. The advantage over a `PCSHELL` is that the other
operations (`PCApplyTranspose()`, `PCMatApply()`) are automatically
inferred.

These tools help make it easier to route operations like
`VecPointwiseMult()` and `VecPointwiseDivide()` through
`KSPSolve()` to avoid handling diagonal matrices as a special
case (a pattern that is going to be removed from `MATLMVM`).

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Merge branch 'stefanozampini/h2opus-dmdakokkos' into 'main'

Add support for KOKKOS in H2OPUS

See merge request petsc/petsc!6408

Add MatCreateDenseForVecType

Remove old implementation (only in main) and update test

and a convenience internal routine to allocate the column vector when requested