Merge branch 'barry/2024-09-02/rebased-fix-conversion-warnings' into 'main'

Compiler finds (and forbid) casts from higher precision integers to lower

See merge request petsc/petsc!7806

Add to CI compilers flags '-Wconversion', '-Wno-sign-conversion', '-Wno-float-conversion', '-Wno-implicit-float-conversion']

Also fix the code to repository to compile cleanly with these flags in th

Add to CI compilers flags '-Wconversion', '-Wno-sign-conversion', '-Wno-float-conversion', '-Wno-implicit-float-conversion']

Also fix the code to repository to compile cleanly with these flags in the CI

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Merge branch 'jacobf/2023-08-17/header-guard-check' into 'main'

Check header guards

See merge request petsc/petsc!6822

Convert all header guards to pragma once

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

Feature: Bicycle Storage Facility 2

See merge request petsc/petsc!5661

Transform all header-guards into ifndefs to make clang-format ignore them for preprocessor indentation

Merge branch 'barry/2022-08-21/clang-format-source' into 'main'

format repository with clang-format

See merge request petsc/petsc!5541

clang-format: convert PETSc sources to comply with clang-format

Merge remote-tracking branch 'origin/jczhang/feature-sf-pack-direct'

Directly pass root/leafdata to MPI in SF when possible

See merge request petsc/petsc!2506

Refactor SF packing

1) Separate out local communication from remote communication
2) Directly pass root/leafdata to MPI when suitable

Merge branch 'jczhang/sf-more-opts' [PR #1567]

* jczhang/sf-more-opts:
Add more optimizations in SF and use it as the default for VecScatter.

Add patterned SF graphs and use x as roots and y as leaves in x to y vecscatter