use ByteString for git config

The parser and looking up config keys in the map should both be faster
due to using ByteString.

I had hoped this would speed up startup time, but any improvement to
that was too small to measure. Seems worth keeping though.

Note that the parser breaks up the ByteString, but a config map ends up
pointing to the config as read, which is retained in memory until every
value from it is no longer used. This can change memory usage
patterns marginally, but won't affect git-annex.

Types/GitConfig.hs

@@ -5,6 +5,8 @@
  - Licensed under the GNU AGPL version 3 or higher.
  -}
 
+{-# LANGUAGE OverloadedStrings #-}
+
 module Types.GitConfig ( 
 	Configurable(..),
 	GitConfig(..),
@@ -199,16 +201,17 @@ extractGitConfig r = GitConfig
 	}
   where
 	getbool k d = fromMaybe d $ getmaybebool k
-	getmaybebool k = Git.Config.isTrue =<< getmaybe k
+	getmaybebool k = Git.Config.isTrue' =<< getmaybe' k
 	getmayberead k = readish =<< getmaybe k
-	getmaybe k = Git.Config.getMaybe k r
-	getlist k = Git.Config.getList k r
+	getmaybe = fmap decodeBS' . getmaybe'
+	getmaybe' k = Git.Config.getMaybe k r
+	getlist k = map decodeBS' $ Git.Config.getList k r
 	getwords k = fromMaybe [] $ words <$> getmaybe k
 
 	configurable d Nothing = DefaultConfig d
 	configurable _ (Just v) = HasConfig v
 
-	annex k = "annex." ++ k
+	annex k = "annex." <> k
 			
 	onemegabyte = 1000000
 
@@ -340,14 +343,15 @@ extractRemoteGitConfig r remotename = do
 		}
   where
 	getbool k d = fromMaybe d $ getmaybebool k
-	getmaybebool k = Git.Config.isTrue =<< getmaybe k
+	getmaybebool k = Git.Config.isTrue' =<< getmaybe' k
 	getmayberead k = readish =<< getmaybe k
-	getmaybe k = mplus (Git.Config.getMaybe (key k) r)
+	getmaybe = fmap decodeBS' . getmaybe'
+	getmaybe' k = mplus (Git.Config.getMaybe (key k) r)
 		(Git.Config.getMaybe (remotekey k) r)
 	getoptions k = fromMaybe [] $ words <$> getmaybe k
 
-	key k = "annex." ++ k
-	remotekey k = "remote." ++ remotename ++ ".annex-" ++ k
+	key k = "annex." <> k
+	remotekey k = "remote." <> encodeBS' remotename <> ".annex-" <> k
 
 notempty :: Maybe String -> Maybe String	
 notempty Nothing = Nothing