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

src/compiler/GF/Infra/SIO.hs

@@ -19,10 +19,11 @@ module GF.Infra.SIO(
        restricted,restrictedSystem
   ) where
 import Prelude hiding (putStrLn,print)
-import Control.Monad(liftM)
+import Control.Applicative(Applicative(..))
+import Control.Monad(liftM,ap)
 import System.IO(hPutStrLn,hFlush,stdout)
 import GF.System.Catch(try)
-import System.Cmd(system)
+import System.Process(system)
 import System.Environment(getEnv)
 import Control.Concurrent.Chan(newChan,writeChan,getChanContents)
 import qualified System.CPUTime as IO(getCPUTime)
@@ -39,6 +40,10 @@ newtype SIO a = SIO {unS::PutStrLn->IO a}
 
 instance Functor SIO where fmap = liftM
 
+instance Applicative SIO where
+  pure = return
+  (<*>) = ap
+
 instance Monad SIO where
   return x = SIO (const (return x))
   SIO m1 >>= xm2 = SIO $ \ h -> m1 h >>= \ x -> unS (xm2 x) h