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

ext/picotcp/test/python/tcpbench_tx_linux.py

@@ -0,0 +1,15 @@
+#!/usr/bin/python
+from  topology import *
+
+T = Topology()
+net1 = Network(T, "pyt0")
+
+#h1 = Host(T, net1)
+h3 = Host(T, net1, args="tcpbench:t:172.16.1.1:6660:")
+
+sleep(1)
+raw_input("Press enter to continue ...")
+start(T)
+
+wait(h3)
+cleanup()