Fix warnings in 16 modules, mostly forward compatibility warnings from GHC 7.8

src/compiler/GF/Infra/UseIO.hs

@@ -31,6 +31,7 @@ import System.Exit
 import System.CPUTime
 --import System.Cmd
 import Text.Printf
+import Control.Applicative(Applicative(..))
 import Control.Monad
 import Control.Monad.Trans(MonadIO(..))
 import Control.Exception(evaluate)
@@ -150,6 +151,10 @@ instance ErrorMonad IOE where
 
 instance Functor IOE where fmap = liftM
 
+instance Applicative IOE where
+  pure = return
+  (<*>) = ap
+
 instance  Monad IOE where
   return a    = ioe (return (return a))
   IOE c >>= f = IOE $ do