no more "Kept" theories

drivers/cvc3.drv

@@ -107,11 +107,6 @@ theory bool.Bool
 end
 *)
 
-
-theory transform.encoding_decorate.Kept
-  meta cloned "encoding_decorate : kept" type t
-end
-
 (*
 Local Variables: 
 mode: why

drivers/simplify.drv

@@ -66,10 +66,6 @@ theory int.Int
   remove prop Total
 end
 
-theory transform.encoding_decorate.Kept
-  meta cloned "encoding_decorate : kept" type t
-end
-
 (*
 Local Variables: 
 mode: why

drivers/z3.drv

@@ -121,10 +121,6 @@ theory int.EuclideanDivision
    remove prop Div_1
 end
 
-theory transform.encoding_decorate.Kept
-  meta cloned "encoding_decorate : kept" type t
-end
-
 (*
 Local Variables: 
 mode: why

theories/transform/encoding_decorate.why

@@ -16,11 +16,6 @@ theory Builtin
          t2u (d2t (sort tty x)) = x
 end
 
-theory Kept
-(* If a driver tags this type by "encoding decorate : kept", all the type which clone this one will be kept by the encoding*)
-       type t
-end
-
 theory Prelude_mono
        logic sort int int : int
        logic int : int