Add a directorin typemap for SWIGTYPE.
Add director_frob_runme.ml, director_pass_by_value_runme.ml, and
director_unroll_runme.ml.
This commit fixes most of the director-related warnings in the OCaml
test suite. Of the director tests that are currently included in the
OCaml test suite, director_basic and director_property are the only
ones which give warnings (due to issues with typecheck typemaps).
