Merge branch 'MarDiehl/improve-Fortran-examples' into 'main'

Improve Fortran examples

See merge request petsc/petsc!8698

Fortran: enforce lower case keywords and operators

also fixed occasional capitals in used modules with the help of @prj-

place all the include statements at the top

Repeated inclusion in multiple location, e.g. at the start of a
module or function is not needed. This becomes clear if all includes are
outside of the ac

place all the include statements at the top

Repeated inclusion in multiple location, e.g. at the start of a
module or function is not needed. This becomes clear if all includes are
outside of the actual Fortran code.
Added regex to check that with the help of @sbalay

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Merge remote-tracking branch 'origin/release'

Merge branch 'tmaon/fortran-add-dmplexgetrestoreclosureindices' into 'release'

Fix DMPlex[Get-Restore]ClosureIndices for Fortran

See merge request petsc/petsc!8540

Fix DMPlex[Get-Restore]ClosureIndices for Fortran

Co-authored-by: Barry Smith <bsmith@petsc.dev>