Rework of GenericMinMax and OrdersTac (helps extraction, cf. #2904)

 Inner sub-modules with "Definition t := t" is hard to handle by
 extraction: "type t = t" is recursive by default in OCaml, and
 the aliased t cannot easily be fully qualified if it comes from
 a higher unterminated module. There already exists some workarounds
 (generating Coq__XXX modules), but this isn't playing nicely with
 module types, where it's hard to insert code without breaking
 subtyping.

 To avoid falling too often in this situation, I've reorganized:

 - GenericMinMax : we do not try anymore to deduce facts about
   min by saying "min is a max on the reversed order". This hack
   was anyway not so nice, some code was duplicated nonetheless
   (at least statements), and the module structure was complex.

 - OrdersTac : by splitting the functor argument in two
   (EqLtLe <+ IsTotalOrder instead of TotalOrder), we avoid
   the need for aliasing the type t, cf NZOrder.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16100 85f007b7-540e-0410-9357-904b9bb8a0f7

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