Add vim modeline to all OCaml files

src/coalg/coalg.ml

src/coalgcompare/coalgcompare.ml

src/debugger/debugger.ml

src/lib/ALCFormula.ml

src/lib/ALCFormula.mli

src/lib/ALCGraph.ml

src/lib/ALCGraph.mli

src/lib/ALCMisc.ml

src/lib/CoAlgFormula.ml

src/lib/CoAlgFormula.mli

src/lib/CoAlgLogicUtils.ml

src/lib/CoAlgLogicUtils.mli

src/lib/CoAlgLogics.ml

src/lib/CoAlgLogics.mli

src/lib/CoAlgMisc.ml

src/lib/CoAlgMisc.mli

src/lib/CoAlgReasoner.ml

src/lib/CoAlgReasoner.mli

src/lib/CoolUtils.ml

src/lib/CoolUtils.mli