Added treatment of transfer modules. Aggregation is an example.

src/GF/Source/AbsGF.hs

@@ -5,6 +5,7 @@ import Ident --H
 -- Haskell module generated by the BNF converter, except --H
 
 -- newtype Ident = Ident String deriving (Eq,Ord,Show) --H
+
 newtype LString = LString String deriving (Eq,Ord,Show)
 data Grammar =
    Gr [ModDef]
@@ -65,7 +66,7 @@ data TopDef =
  | DefFun [FunDef]
  | DefDef [Def]
  | DefData [DataDef]
- | DefTrans [FlagDef]
+ | DefTrans [Def]
  | DefPar [ParDef]
  | DefOper [Def]
  | DefLincat [PrintDef]