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 'tisaac/feature-malloc-dump-finalize' into 'main'

Sys: Introduce -on_error_malloc_dump and PETSC_ERR_MEM_LEAK

See merge request petsc/petsc!6745

Sys: Introduce -on_error_malloc_dump and PETSC_ERR_MEM_LEAK

To avoid a malloc dump that swamps the error output of another error,
this makes calling `PetscMallocDump()` in the error handlers opt-in,

Sys: Introduce -on_error_malloc_dump and PETSC_ERR_MEM_LEAK

To avoid a malloc dump that swamps the error output of another error,
this makes calling `PetscMallocDump()` in the error handlers opt-in,
with a different flag (`-on_error_malloc_dump`) from the flag for
calling `PetscMallocDump()` in `PetscFinalize()` (just `-malloc_dump`).

The addition of `PETSC_ERR_MEM_LEAK` allows for better error messages:
`~PoolAllocator()` can detect a memory leak even if the system
is not out of memory, so the error message will not say that for
`PETSC_ERR_MEM_LEAK`.

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