concurrent-output, first pass

Output without -Jn should be unchanged from before. With -Jn,
concurrent-output is used for messages, but regions are not used yet, so
it's a mess.

CmdLine/Action.hs

@@ -47,7 +47,7 @@ performCommandAction Command { cmdcheck = c, cmdname = name } seek cont = do
 commandAction :: CommandStart -> Annex ()
 commandAction a = withOutputType go 
   where
-	go (ParallelOutput n) = do
+	go (ConcurrentOutput n) = do
 		ws <- Annex.getState Annex.workers
 		(st, ws') <- if null ws
 			then do

CmdLine/GitAnnex/Options.hs

@@ -283,7 +283,7 @@ jsonOption = globalFlag (Annex.setOutput JSONOutput)
 	)
 
 jobsOption :: GlobalOption
-jobsOption = globalSetter (Annex.setOutput . ParallelOutput) $ 
+jobsOption = globalSetter (Annex.setOutput . ConcurrentOutput) $ 
 	option auto
 		( long "jobs" <> short 'J' <> metavar paramNumber
 		<> help "enable concurrent jobs"