Log Message:
Make oxenstored (more) usable, as originally researched by
Aaron J. Grier, with implementation changes by myself:

- rules to add the run-time path correctly when building shared versions
  of libraries. Using -dllpath to ocamlmklib for this - ',' would need
  to be clumsily escaped from gmake.

  (This also needs a patched ocamlmklib - from ocaml 4.00.1nb2 -
  that has -elfmode which prevents -L paths being added to the
  run-time path).

- Path fixes, but not using fixed paths as originally proposed,
  but the SUBST framework.

- Trim whitespace off a numeric string read out of the kernel.
  Instead of open coding the function, use String.trim, as the
  String library is used, anyway. (available in ocaml >= 4.00.1)