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dans les drivers il n'y a qu'une seul liste de transformations

- assure generation of new variables on create_ls_defn

provide ns_find_prop and ns_find_fmla for convenience

to use proposition names as propositional variables

- unify Lfunction and Lpredicate (mucho bettar)
- separation of prop and fmla
- making prop and tvsymbol private aliases of ident

 - Ajout de split_conjunction
 - Ajout du choix d'appliquer les transformations avant ou après la séparation
   en un but par contexte (certainement à modifier)
 - Ajout de quelques transformations et plugins
 - ajout des options list-printers et list-transforms

without changing their order - NOT a topological sort

- move redefinition of f_app higher in Term
  to make sure that ps_neq can never appear
- if a user "instantiates" a lemma as a goal on cloning, 
  the lemma just disappears (as it is alredy proved)
- catch Not_found in merge_namespace on cloning,
  due to local goals not being cloned

- copy the code of Pretty to Why3 to prepare it for Driver
- move goal_of_ctxt to Transform, where it belongs 
- comment out the unused "extract_goals" in Transform
- comment out the debugging printing in Theory, use Pretty
- in use_export, put the Duse declaration after the copied
  declarations, not before

ajout aux fonctions de pretty un argument ?printer pour que why3 puisse creer un nouveau printer pour chaque fichier