add v6; keep v5 working for now and manual upgrade

Since all places where a repo is used in direct mode need to have git-annex
upgraded before the repo can safely be converted to v6, the upgrade needs
to be manual for now.

I suppose that at some point I'll want to drop all the direct mode support
code. At that point, will stop supporting v5, and will need to auto-upgrade
any remaining v5 repos. If possible, I'd like to carry the direct mode
support for say, a year or so, to give people plenty of time to upgrade and
avoid disruption.

Upgrade/V1.hs

@@ -54,14 +54,14 @@ upgrade = do
 	ifM (fromRepo Git.repoIsLocalBare)
 		( do
 			moveContent
-			setVersion supportedVersion
+			setVersion currentVersion
 		, do
 			moveContent
 			updateSymlinks
 			moveLocationLogs
 	
 			Annex.Queue.flush
-			setVersion supportedVersion
+			setVersion currentVersion
 		)
 	
 	Upgrade.V2.upgrade

Upgrade/V5.hs

@@ -0,0 +1,18 @@
+{- git-annex v5 -> v6 uppgrade support
+ -
+ - Copyright 2015 Joey Hess <id@joeyh.name>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Upgrade.V5 where
+
+import Common.Annex
+import Config
+
+upgrade :: Bool -> Annex Bool
+upgrade automatic = do
+	unless automatic $
+		showAction "v5 to v6"
+	configureSmudgeFilter
+	return True