reorder repo parameters last

Many functions took the repo as their first parameter. Changing it
consistently to be the last parameter allows doing some useful things with
currying, that reduce boilerplate.

In particular, g <- gitRepo is almost never needed now, instead
use inRepo to run an IO action in the repo, and fromRepo to get
a value from the repo.

This also provides more opportunities to use monadic and applicative
combinators.

Annex/UUID.hs

@@ -45,23 +45,23 @@ getUUID = getRepoUUID =<< gitRepo
 {- Looks up a repo's UUID. May return "" if none is known. -}
 getRepoUUID :: Git.Repo -> Annex UUID
 getRepoUUID r = do
-	g <- gitRepo
-
-	let c = cached g
+	c <- fromRepo cached
 	let u = getUncachedUUID r
 	
 	if c /= u && u /= NoUUID
 		then do
-			updatecache g u
+			updatecache u
 			return u
 		else return c
 	where
-		cached g = toUUID $ Git.configGet g cachekey ""
-		updatecache g u = when (g /= r) $ storeUUID cachekey u
+		cached g = toUUID $ Git.configGet cachekey "" g
+		updatecache u = do
+			g <- gitRepo
+			when (g /= r) $ storeUUID cachekey u
 		cachekey = "remote." ++ fromMaybe "" (Git.repoRemoteName r) ++ ".annex-uuid"
 
 getUncachedUUID :: Git.Repo -> UUID
-getUncachedUUID r = toUUID $ Git.configGet r configkey ""
+getUncachedUUID = toUUID . Git.configGet configkey ""
 
 {- Make sure that the repo has an annex.uuid setting. -}
 prepUUID :: Annex ()