Do not warn on "New" if blocks are unchanged since opening

Plus tidy some comments

src/main/java/com/ardublock/ArduBlockTool.java

@@ -45,7 +45,6 @@ public void init(Editor editor) {
 			// Don't just "close" Ardublock, see if there's something to save first.
 			// Note to self: Code here only affects behaviour when we're an Arduino Tool,
 			// not when run directly - See Main.java for that.
-			// Closing the Arduino IDE itself will still lose work!
 			//ArduBlockTool.openblocksFrame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
 			ArduBlockTool.openblocksFrame.addWindowListener( new WindowAdapter()
 			{

src/main/java/com/ardublock/Main.java

@@ -37,7 +37,6 @@ private void startOpenblocksFrame() throws SAXException, IOException, ParserConf
 		// Don't just "close" Ardublock, see if there's something to save first.
 		// Note to self: This only affects behaviour when we're run directly,
 		// not when we're an Arduino Tool - See ArduBlockTool.java for that.
-		// Closing the Arduino IDE itself will still lose work!
 
 		//openblocksFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 

src/main/java/com/ardublock/ui/OpenblocksFrame.java

@@ -354,6 +354,15 @@ public void doNewArduBlockFile()
                     break;
 			}
 		}
+		else
+		{
+			// If workspace unchanged just start a new Ardublock
+			this.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
+    		context.resetWorksapce();
+    		context.setWorkspaceChanged(false);
+    		this.setTitle(this.makeFrameTitle());
+    		this.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
+		}
 
 	}