OrderedType implementation for various numerical datatypes + min/max structures

 - A richer OrderedTypeFull interface : OrderedType + predicate "le"
 - Implementations {Nat,N,P,Z,Q}OrderedType.v, also providing "order" tactics
 - By the way: as suggested by S. Lescuyer, specification of compare is
   now inductive
 - GenericMinMax: axiomatisation + properties of min and max out of
    OrderedTypeFull structures.
 - MinMax.v, {Z,P,N,Q}minmax.v are specialization of GenericMinMax,
    with also some domain-specific results, and compatibility layer
    with already existing results.
 - Some ML code of plugins had to be adapted, otherwise wrong "eq",
   "lt" or simimlar constants were found by functions like coq_constant.
 - Beware of the aliasing problems: for instance eq:=@eq t instead of
   eq:=@eq M.t in Make_UDT made (r)omega stopped working (Z_as_OT.t
   instead of Z in statement of Zmax_spec).
 - Some Morphism declaration are now ambiguous: switch to new syntax
   anyway.
 - Misc adaptations of FSets/MSets
 - Classes/RelationPairs.v: from two relations over A and B, we
   inspect relations over A*B and their properties in terms of classes.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@12461 85f007b7-540e-0410-9357-904b9bb8a0f7

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