Fix PetscOptionsGetViewer() so it works in a thread-safe way

When PetscOptionsGetViewer() returns, for example, PETSC_VIEWER_STDOUT_SELF the same object is shared
by all threads that call PetscOptio

Fix PetscOptionsGetViewer() so it works in a thread-safe way

When PetscOptionsGetViewer() returns, for example, PETSC_VIEWER_STDOUT_SELF the same object is shared
by all threads that call PetscOptionsGetViewer(). In the previous code PetscObjectReference() and
dereference (via PetscViewerDestroy() where called on the viewer by multiple threads after the viewer
was accessed thus corrupting the object.

This branch introduces a PetscOptionsRestoreViewer() that allows not doing the referencing and dereferencing
on persistant viewers, thus removing the specific race condition above.

Other possible solutions include

Use a lock on each PetscObjectReference/Dereference() just in case they are shared. Could be time consuming so one
could mark each object as either threadshared or independent and only do the locks on threadshared objects. This lowers
the cost but would require more extensive changes to PETSc infrastructure. And I do not know if this shared/not shared model
is what we need in the long run, though it might be.

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Merge branch 'adams/gamg-square-graph-true' into 'main'

GAMG: switch the default to using square graph

See merge request petsc/petsc!6923

GAMG: switch the default to using square graph

Merge branch 'adams/gamg-add-old-filter' into 'main'

Add PCGAMGSetLowMemoryFilter() with -pc_gamg_low_memory_threshold_filter for...

See merge request petsc/petsc!6918

Add PCGAMGSetLowMemoryFilter() with -pc_gamg_low_memory_threshold_filter for...

Merge branch 'adams/gamg-add-old-coarsening' into 'main'

add-old-coarsening and small cleanups

See merge request petsc/petsc!6814

add old aggressive coarsening algorithm as option, switch default MIS ordering algorithm back to old one

Merge branch 'tisaac/feature-log-handler' into 'main'

Deglobalize logging into PetscLogHandler and PetscLogState

See merge request petsc/petsc!6709

Profiling: Improve !defined(PETSC_USE_LOG) #defines

- If we cast macro arguments to void, we can avoid unused errors that have
forced lots of conditionally included code like this:

```c
#if def

Profiling: Improve !defined(PETSC_USE_LOG) #defines

- If we cast macro arguments to void, we can avoid unused errors that have
forced lots of conditionally included code like this:

```c
#if defined(PETSC_USE_LOG)
PetscLogEvent event;
#endif
```

- Having global counters like petsc_TotalFlops externed event
if !PetscDefined(USE_LOG) helps to remove a lot of needless
`#ifdef`s around code that can instead be placed in
`if (PetscDefined(USE_LOG)) {}` blocks.

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Merge branch 'jacobf/2022-12-10/petscerrorcode-nodiscard' into 'main'

Feature: Non-discardable PetscErrorCode

See merge request petsc/petsc!5923

Make PetscErrorCode a non-discardable enum

Merge branch 'adams/snes-tutorials-ex56-update' into 'main'

Adams/snes tutorials ex56 update

See merge request petsc/petsc!5910

Adams/snes tutorials ex56 update

Merge branch 'adams/snesex56_refactor' into 'main'

Update SNES/tutorials/ex56 with modern use of Plex, a Laplacian test in addition to the elasticity test, and some cleanup of ad hoc code.

See merg

Merge branch 'adams/snesex56_refactor' into 'main'

Update SNES/tutorials/ex56 with modern use of Plex, a Laplacian test in addition to the elasticity test, and some cleanup of ad hoc code.

See merge request petsc/petsc!5814

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Update SNES/tutorials/ex56 with modern use of Plex, a Laplacian test in addition to the elasticity test, and some cleanup of ad hoc code.

Merge branch 'suyash/hip' into 'main'

Add HIP support to Mat class in PETSc

See merge request petsc/petsc!5383

Add HIP support to Mat class in PETSc

Co-authored-by: Justin Chang <jychang48@gmail.com>

Fixed-by: Jacob Faibussowitsch <jacob.fai@gmail.com>
Fixed-by: Junchao Zhang <jczhang@mcs.anl.gov>
Fixed-by:

Add HIP support to Mat class in PETSc

Co-authored-by: Justin Chang <jychang48@gmail.com>

Fixed-by: Jacob Faibussowitsch <jacob.fai@gmail.com>
Fixed-by: Junchao Zhang <jczhang@mcs.anl.gov>
Fixed-by: Satish Balay <balay@mcs.anl.gov>

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Merge branch 'jacobf/2022-09-21/2-bike-2-shed' into 'main'

Feature: Bicycle Storage Facility 2

See merge request petsc/petsc!5661

source code format changes due to .clang-format changes

Merge branch 'jolivet/fix-style-one-liners' into 'main'

Remove braces from one-liners w/o PetscCall()

See merge request petsc/petsc!5561

Remove braces from one-liners w/o PetscCall()

Merge branch 'jolivet/fix-style-one-liners' into 'main'

Remove braces from one-liners

See merge request petsc/petsc!5557

Remove braces from one-liners

Merge branch 'jczhang/for-jlse-test' into 'main'

Turn on remaining petsc/kokkos tests for sycl

See merge request petsc/petsc!5556

Tests: turn on some kokkos tests for sycl