adding user friendly hint (Message dialog)

Author: Microos

src/hk/microos/data/Flags.java

@@ -1,7 +1,7 @@
 package hk.microos.data;
 
 public class Flags {
-	public static boolean GLOABAL_DEBUG = true;
+	public static boolean GLOABAL_DEBUG = false;
 	public static boolean FUNC_INVOKE_PRINT = true;
 	public static double minStroke = 2;
 	public static double maxStroke = 5;

src/hk/microos/data/LinearLine.java

@@ -1,6 +1,5 @@
 package hk.microos.data;
 
-import java.util.ArrayList;
 
 import hk.microos.tools.UniversalTool;