Extraction: Richer patterns in matchs as proposed by P.N. Tollitte

 The MLcase has notably changed:
  - No more case_info in it, but only a type annotation
  - No more "one branch for one constructor", but rather a sequence
    of patterns. Earlier "full" pattern correspond to pattern Pusual.
    Patterns Pwild and Prel allow to encode optimized matchs without
    hacks as earlier. Other pattern situations aren't used (yet)
    by extraction, but only by P.N Tollitte's code.

 A MLtuple constructor has been introduced. It isn't used by
 the extraction for the moment, but only but P.N. Tollitte's code.

 Many pretty-print functions in ocaml.ml and other have been reorganized

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@14734 85f007b7-540e-0410-9357-904b9bb8a0f7

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