added support for UDP devices, added buffer for network devices, added option for sending an initial symbol after opening a network device, added option for setting transfer latency and use default 10 ms for network device, set TCP_NODELAY for TCP device socket, flush potentially buffered input on network device when connecting

src/lib/ebus/test/test_device.cpp

@@ -24,7 +24,7 @@ using namespace std;
 
 int main ()
 {
-	Device* device = Device::create("/dev/ttyUSB20", true, NULL);
+	Device* device = Device::create("/dev/ttyUSB20", true, false, NULL);
 	if (device == NULL) {
 		cout << "unable to create device" << endl;
 		return -1;