now the datatype Tree is only internal. All API functions are working with Expr directly. Commands gt, gr, p and rf filter out the output via the typechecker

src/GF/Command/Parse.hs

@@ -2,7 +2,6 @@ module GF.Command.Parse(readCommandLine, pCommand) where
 
 import PGF.CId
 import PGF.Expr
-import PGF.Data(Tree)
 import GF.Command.Abstract
 
 import Data.Char