fix math error that caused resumes to always fail

P2P/Annex.hs

@@ -125,4 +125,4 @@ runLocal runmode runner a = case a of
 				hSeek h AbsoluteSeek o
 			L.hPut h b
 		sz <- getFileSize dest
-		return (toInteger sz == l)
+		return (toInteger sz == l + o)

doc/todo/tor.mdwn

@@ -6,8 +6,9 @@ Current todo list:
 
 * copy --to peer seems to make the remotedaemon buffer the content in
   memory, more than I'd expect.
+* There are no error messages when things fail. Need to convert P2P runner
+  from Maybe to Either String.
 * update progress logs in remotedaemon send/receive
-* Resuming an interrupted download fails at the end.
 * Think about locking some more. What happens if the connection to the peer
   is dropped while we think we're locking content there from being dropped?
 * merge to master