blind enabling gcrypt repos on rsync.net

This pulls off quite a nice trick: When given a path on rsync.net, it
determines if it is an encrypted git repository that the user has
the key to decrypt, and merges with it. This is works even when
the local repository had no idea that the gcrypt remote exists!

(As previously done with local drives.)

This commit sponsored by Pedro Côrte-Real

GitAnnexShell.hs

@@ -61,7 +61,7 @@ options = Option.common ++
 		check u | u == toUUID expected = noop
 		check NoUUID = checkGCryptUUID expected
 		check u = unexpectedUUID expected u
-	checkGCryptUUID expected = inRepo getGCryptUUID >>= check
+	checkGCryptUUID expected = check =<< getGCryptUUID True =<< gitRepo
 	  where
 	  	check (Just u) | u == toUUID expected = noop
 		check Nothing = unexpected expected "uninitialized repository"