fix for "Underlying input stream returned zero bytes"

timeout would cause the following error: "java.io.IOException: Underlying input stream returned zero bytes"

src/com/t_oster/liblasercut/drivers/GenericGcodeDriver.java

@@ -409,7 +409,7 @@ public class GenericGcodeDriver extends LaserCutter {
         port = i.open("VisiCut", 1000);
         try
         {
-          port.enableReceiveTimeout(1000);
+          port.enableReceiveTimeout(15000);
         }
         catch (UnsupportedCommOperationException e)
         {