PGF library: expose only PGF and PGF.Internal instead of all modules

PGF exports the public, stable API.
PGF.Internal exports additional things needed in the GF compiler & shell,
including the nonstardard version of Data.Binary.

src/compiler/GF/Infra/Ident.hs

@@ -30,7 +30,7 @@ import qualified Data.ByteString.Char8 as BS(append,isPrefixOf)
                  -- Limit use of BS functions to the ones that work correctly on
                  -- UTF-8-encoded bytestrings!
 import Data.Char(isDigit)
-import Data.Binary(Binary(..))
+import PGF.Internal(Binary(..))
 import Text.PrettyPrint(Doc,text)
 
 

src/compiler/GF/Infra/Option.hs

@@ -43,7 +43,7 @@ import GF.Data.Operations(Err,ErrorMonad(..),liftErr)
 import Data.Set (Set)
 import qualified Data.Set as Set
 
-import PGF.Data(Literal(..))
+import PGF.Internal(Literal(..))
 
 usageHeader :: String
 usageHeader = unlines