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/Speech/CFGToFA.hs

@@ -14,8 +14,7 @@ import qualified Data.Map as Map
 import Data.Set (Set)
 import qualified Data.Set as Set
 
---import PGF.CId
-import PGF.Data
+import PGF.Internal
 import GF.Data.Utilities
 import GF.Grammar.CFG
 --import GF.Speech.PGFToCFG

src/compiler/GF/Speech/JSGF.hs

@@ -18,8 +18,7 @@ import GF.Grammar.CFG
 import GF.Speech.RegExp
 import GF.Speech.SISR
 import GF.Speech.SRG
---import PGF.CId
-import PGF.Data
+import PGF
 
 import Data.Char
 import Data.List

src/compiler/GF/Speech/PGFToCFG.hs

@@ -7,8 +7,7 @@
 module GF.Speech.PGFToCFG (bnfPrinter, pgfToCFG) where
 
 import PGF(showCId)
-import PGF.Data as PGF
-import PGF.Macros
+import PGF.Internal as PGF
 --import GF.Infra.Ident
 import GF.Grammar.CFG hiding (Symbol)
 

src/compiler/GF/Speech/VoiceXML.hs

@@ -12,8 +12,7 @@ module GF.Speech.VoiceXML (grammar2vxml) where
 import GF.Data.XML
 --import GF.Infra.Ident
 import PGF
-import PGF.Data
-import PGF.Macros
+import PGF.Internal
 
 --import Control.Monad (liftM)
 import Data.List (intersperse) -- isPrefixOf, find