RawFilePath conversion of System.Directory

By using System.Directory.OsPath, which takes and returns OsString,
which is a ShortByteString. So, things like dirContents currently have the
overhead of copying that to a ByteString, but that should be less than
the overhead of using Strings which often in turn were converted to
RawFilePaths.

Added Utility.OsString and the OsString build flag. That flag is turned
on in the stack.yaml, and will be turned on automatically by cabal when
built with new enough libraries. The stack.yaml change is a bit ugly,
and that could be reverted for now if it causes any problems.

Note that Utility.OsString.toOsString on windows is avoiding only a
check of encoding that is documented as being unlikely to fail. I don't
think it can fail in git-annex; if it could, git-annex didn't contain
such an encoding check before, so at worst that should be a wash.

Remote/BitTorrent.hs

@@ -35,6 +35,7 @@ import qualified Utility.RawFilePath as R
 
 import Network.URI
 import qualified System.FilePath.ByteString as P
+import qualified Data.ByteString as S
 
 #ifdef WITH_TORRENTPARSER
 import Data.Torrent
@@ -208,9 +209,7 @@ downloadTorrentFile u = do
 					let metadir = othertmp P.</> "torrentmeta" P.</> kf
 					createAnnexDirectory metadir
 					showOutput
-					ok <- downloadMagnetLink u
-						(fromRawFilePath metadir)
-						(fromRawFilePath torrent)
+					ok <- downloadMagnetLink u metadir torrent
 					liftIO $ removeDirectoryRecursive
 						(fromRawFilePath metadir)
 					return ok
@@ -225,14 +224,14 @@ downloadTorrentFile u = do
 						return ok
 		)
 
-downloadMagnetLink :: URLString -> FilePath -> FilePath -> Annex Bool
+downloadMagnetLink :: URLString -> RawFilePath -> RawFilePath -> Annex Bool
 downloadMagnetLink u metadir dest = ifM download
 	( liftIO $ do
-		ts <- filter (".torrent" `isSuffixOf`)
+		ts <- filter (".torrent" `S.isSuffixOf`)
 			<$> dirContents metadir
 		case ts of
 			(t:[]) -> do
-				moveFile (toRawFilePath t) (toRawFilePath dest)
+				moveFile t dest
 				return True
 			_ -> return False
 	, return False
@@ -245,7 +244,7 @@ downloadMagnetLink u metadir dest = ifM download
 		, Param "--seed-time=0"
 		, Param "--summary-interval=0"
 		, Param "-d"
-		, File metadir
+		, File (fromRawFilePath metadir)
 		]
 
 downloadTorrentContent :: Key -> URLString -> FilePath -> Int -> MeterUpdate -> Annex Bool