Repository tuning parameters can now be passed when initializing a repository for the first time.

* init: Repository tuning parameters can now be passed when initializing a
  repository for the first time. For details, see
  http://git-annex.branchable.com/tuning/
* merge: Refuse to merge changes from a git-annex branch of a repo
  that has been tuned in incompatable ways.

Command/Fsck.hs

@@ -192,7 +192,7 @@ check cs = and <$> sequence cs
  -}
 fixLink :: Key -> FilePath -> Annex Bool
 fixLink key file = do
-	want <- inRepo $ gitAnnexLink file key
+	want <- calcRepo $ gitAnnexLink file key
 	have <- getAnnexLinkTarget file
 	maybe noop (go want) have
 	return True