made copper actually add sent messages to the filter

modules/net/copper.lua

@@ -28,6 +28,7 @@ spawn("copperd",function() print(pcall(function ()
    p.msg = ev[4]
    p.at = 0
    p.lt = 0
+   pt[cdlib.encode(0,net.id,p.nid,relib.encode(p)):sub(2)] = os.time()
    ps[p.pid] = p
   elseif ev[1] == "modem_message" and ev[4] == net.np and ev[6] == "copper" then
    local hops,src,dst,data = cdlib.decode(ev[7])