* Throttle: Reject tunnels for first 20m uptime (was 10m)

* TunnelPeerSelectors:
       - Re-enable strict ordering of peers,
         based on XOR distance from a random hash
       - Restrict peers with uptime < 90m from tunnels (was 2h),
         which is really 60m due to rounding in netDb publishing.
    * i2psnark:
       - Limit max pipelined requests from a single peer to 128KB
         (was unlimited; i2p-bt default is 5 * 64KB)
       - Increase max uploaders per torrent to 6 (was 4)
       - Reduce max connections per torrent to 16 (was 24) to increase
         unchoke time and reduce memory consumption
       - Strictly enforce max connections per torrent
       - Choke more gradually when over BW limit
    * help.jsp: Add a link to the FAQ
    * peers.jsp: Fix UDP direction indicators
    * hosts.txt: Add update.postman.i2p

apps/i2psnark/java/src/org/klomp/snark/PeerConnectionOut.java

@@ -392,6 +392,23 @@ class PeerConnectionOut implements Runnable
     req.sendTime = System.currentTimeMillis();
   }
 
+  // Used by PeerState to limit pipelined requests
+  int queuedBytes()
+  {
+    int total = 0;
+    synchronized(sendQueue)
+      {
+        Iterator it = sendQueue.iterator();
+        while (it.hasNext())
+          {
+            Message m = (Message)it.next();
+            if (m.type == Message.PIECE)
+                total += m.length;
+          }
+      }
+    return total;
+  }
+
   void sendPiece(int piece, int begin, int length, byte[] bytes)
   {
     Message m = new Message();