merge opam from opam-repository, but add again removed fields 'authors' and 'run-test', and allow ocaml 4.07
merge opam from opam-repository, but add again removed fields 'authors' and 'run-test', and allow ocaml 4.07

goblint/analyzer,goblint/analyzer,goblint/analyzer,goblint/analyzer,goblint/analyzer