now is enable build and delete towers in game and improve graphic perfomance

find and correct many-many bugs

aliens.cpp

@@ -42,13 +42,17 @@ void Aliens::addAlien(int srcId)
 
 void Aliens::retrace(bool * OK)
 {
-	qDebug("re-trace!");
+	//qDebug("re-trace!");
 	gameData->map->removeAliensPath();
 	for (QHash<int, AlienType>::iterator i = gameData->curAliens.begin(); i != gameData->curAliens.end(); ++i)
 	{
 		(*i).path = gameData->map->createPath((*i).pos.toPoint(),(*i).finish);
 		(*i).pathIndex = 1;
-		if ((*i).path.isEmpty()) *OK = false;
+		if ((*i).path.isEmpty())
+		{
+			*OK = false;
+			qDebug("Aliens retrace = false");
+		}
 	}
 }