fixed circular domain on Landau

More manual page fixes

Remove need for seperate lib/petsc/conf/test file by merging with rules file

Commit-type: maintainability

non-test and tutorial makefiles only need rules.doc not the full rules

Commit-type: documentation

Only makefiles in the test and tutorial directories need lib/petsc/conf/test

Commit-type: housekeeping

Switch to clang-format 16

Remove now unneeded SOURCE* variables from makefiles

Commit-type: configure, housekeeping

Remove unneeded SOURCEH from makefiles

No longer used by docs or build

Fix sanitizer errors

Fix build error with linux-misc-32bit

Fix unused-parameter warning

src/ts/utils/dmplexlandau/cuda/landaucu.cu:71:272: error: unused parameter ‘a_lambdas’ [-Werror=unused-parameter]

Merge branch 'jeremy/less-strcpy-strcat' into 'main'

Use Petsc[Strncpy,Strlcat,Memcpy] over Petsc[Strcpy,Strcat]

Closes #1332

See merge request petsc/petsc!6115

Clean up PETSc str ops to use more secure implementations where possible. These include:

- Use PetscStrncpy()/PetscStrlcat()/PetscMemcpy() over PetscStrcpy()/PetscStrcat()
- Use PetscArraycpy() over

Clean up PETSc str ops to use more secure implementations where possible. These include:

- Use PetscStrncpy()/PetscStrlcat()/PetscMemcpy() over PetscStrcpy()/PetscStrcat()
- Use PetscArraycpy() over PetscMemcpy() as appropriate for string buffer copying
- Use built in string from name over hardcoding
- Use sizeof over hardcoded length
- Replace some Strlcat with Strncpy when offset is known

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