updated picoTCP to 1.4.0, lowered build optimization levels to -O2, improved selftest

ext/picotcp/test/python/tcpbench.py

@@ -0,0 +1,17 @@
+#!/usr/bin/python
+#
+
+from  topology import *
+
+T = Topology()
+net1 = Network(T)
+send1 = Host(T, net1, args="tcpbench:t:172.16.1.2:7770:")
+recv1 = Host(T, net1, args="tcpbench:r:7770:")
+
+
+sleep(1)
+#raw_input("Press enter to continue ...")
+
+start(T)
+wait(send1)
+cleanup()