Convert from Text.PrettyPrint to GF.Text.Pretty

All compiler modules now use GF.Text.Pretty instead of Text.PrettyPrint

src/compiler/GF/Compile/Compute/AppPredefined.hs

@@ -23,7 +23,7 @@ import GF.Grammar
 import GF.Grammar.Predef
 
 import qualified Data.Map as Map
-import Text.PrettyPrint
+import GF.Text.Pretty
 import Data.Char (isUpper,toUpper,toLower)
 
 -- predefined function type signatures and definitions. AR 12/3/2003.
@@ -140,4 +140,4 @@ mapStr ty f t = case (ty,t) of
    mapField (mty,te) = case mty of
      Just ty -> (mty,mapStr ty f te)
      _ -> (mty,te)
--}
+-}