made the piece picker handle multi-request blocks better. fixes problem that might occur at the end of a torrent where the piece picker could take over blocks back and forth

test/setup_transfer.cpp

@@ -105,7 +105,6 @@ setup_transfer(session* ses1, session* ses2, session* ses3
 	{
 		// give the other peers some time to get an initial
 		// set of pieces before they start sharing with each-other
-		test_sleep(10000);
 		tor3.connect_peer(tcp::endpoint(
 			address::from_string("127.0.0.1")
 			, ses2->listen_port()));

test/test_swarm.cpp

@@ -54,7 +54,7 @@ void test_swarm()
 	int count_dl_rates2 = 0;
 	int count_dl_rates3 = 0;
 
-	for (int i = 0; i < 100; ++i)
+	for (int i = 0; i < 35; ++i)
 	{
 		std::auto_ptr<alert> a;
 		a = ses1.pop_alert();