Micromega: improvement of the code obtained by extraction

  * In eval_cone and simpl_cone, default patterns were leading
    to duplicated computations. Adaptation of RingMicromega.v
    to prevent that.
  * Use the Ocaml builtin types (lists, pairs, bool, etc) and
    remove the useless conversion functions in mutils.ml and alii.
  * andb was extracted to a correctly lazy but ugly match.
    Let's rather use Ocaml's (&&).

  Remain to be done: take advantage of extraction during the build,
   - either directly if we are using plugins, (no dependency issues)
   - or if we compile statically, at least check later that the
     micromega.ml in the archive and the one auto-generated are in sync.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@12034 85f007b7-540e-0410-9357-904b9bb8a0f7

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