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

ext/picotcp/test/python/udpecho.py

@@ -0,0 +1,16 @@
+#!/usr/bin/python
+#
+
+from  topology import *
+
+T = Topology()
+net1 = Network(T,"udp0")
+echo = Host(T, net1, args="udpecho:172.16.1.2:7770:7770:1400:")
+
+
+sleep(1)
+raw_input("Press enter to continue ...")
+
+start(T)
+wait(echo)
+cleanup()