Just partially connected to existing theory

  Memorylimit with 20G reached on exemple of union.mlw

    terms can be grouped and scheduling of those decisions freezed

    And check the model before sat

    - But in order to be really useful in fourier factorization is needed

  - deduce only contradiction

      perhaps some inefficiency since there are more propagators

 - RealValue: constants
 - Dom_interval: interval domaine
 - Dom_polynome: Polynome, pivot (shostak theory like)

  Don't use Expr.* for ground terms and type

   except the one about efficiency with learning

    Forgotten substitution of the arguments

 Modifications made by François Bobot, Stéphane Graham-Lengrand and Guillaume
 Bury. The witan licence has been used for the files not mainly modified by Bobot