reorganize the directories under src, and rescue the JavaScript interpreter from deprecated

src/runtime/haskell/PGF/Expr.hs-boot

@@ -0,0 +1,28 @@
+module PGF.Expr where
+
+import PGF.CId
+import qualified Text.PrettyPrint as PP
+import qualified Text.ParserCombinators.ReadP as RP
+
+data Expr
+
+instance Eq   Expr
+instance Ord  Expr
+instance Show Expr
+
+
+data BindType = Explicit | Implicit
+
+instance Eq   BindType
+instance Ord  BindType
+instance Show BindType
+
+
+pArg   :: RP.ReadP Expr
+pBinds :: RP.ReadP [(BindType,CId)]
+
+ppExpr :: Int -> [CId] -> Expr -> PP.Doc
+
+freshName :: CId -> [CId] -> CId
+
+ppParens :: Bool -> PP.Doc -> PP.Doc