Fix display of unicode filenames.

Internally, the filenames are stored as un-decoded unicode.
I tried decoding them, but then haskell tries to access the wrong files.
Hmm.

So, I've unhappily chosen option "B", which is to decode filenames before
they are displayed.

Command/Find.hs

@@ -12,6 +12,7 @@ import Control.Monad.State (liftIO)
 
 import Command
 import Content
+import Messages
 
 command :: [Command]
 command = [Command "find" (paramOptional $ paramRepeating paramPath) seek
@@ -24,5 +25,5 @@ seek = [withFilesInGit start]
 start :: CommandStartString
 start file = isAnnexed file $ \(key, _) -> do
 	exists <- inAnnex key
-	when exists $ liftIO $ putStrLn file
+	when exists $ liftIO $ putStrLn $ showFile file
 	return Nothing

Command/PreCommit.hs

@@ -32,7 +32,7 @@ perform pair@(file, _) = do
 	ok <- doCommand $ Command.Add.start pair
 	if ok
 		then return $ Just $ cleanup file
-		else error $ "failed to add " ++ file ++ "; canceling commit"
+		else error $ "failed to add " ++ showFile file ++ "; canceling commit"
 
 cleanup :: FilePath -> CommandCleanup
 cleanup file = do

Command/Unused.hs

@@ -68,7 +68,7 @@ checkUnused = do
 		dropmsg = ["(To remove unwanted data: git-annex dropunused NUMBER)"]
 			
 		table l = ["  NUMBER  KEY"] ++ map cols l
-		cols (n,k) = "  " ++ pad 6 (show n) ++ "  " ++ show k
+		cols (n,k) = "  " ++ pad 6 (show n) ++ "  " ++ (showFile . show) k
 		pad n s = s ++ replicate (n - length s) ' '
 
 number :: Int -> [a] -> [(Int, a)]