fix a few more memory errors

src/game/GameModel.cpp

@@ -183,6 +183,10 @@ GameModel::~GameModel()
 	{
 		delete *iter;
 	}
+	for(std::vector<Notification*>::iterator iter = notifications.begin(); iter != notifications.end(); ++iter)
+	{
+		delete *iter;
+	}
 	delete sim;
 	delete ren;
 	if(placeSave)

src/interface/Engine.cpp

@@ -116,16 +116,16 @@ int Engine::CloseWindow()
 {
 	if(!windows.empty())
 	{
+		if (lastBuffer)
+		{
+			free(lastBuffer);
+			lastBuffer = NULL;
+		}
 		if(!prevBuffers.empty())
 		{
 			lastBuffer = prevBuffers.top();
 			prevBuffers.pop();
 		}
-		else
-		{
-			free(lastBuffer);
-			lastBuffer = NULL;
-		}
 		state_ = windows.top();
 		windows.pop();
 

src/search/SearchController.cpp

@@ -88,8 +88,6 @@ void SearchController::Exit()
 	}
 	if(callback)
 		callback->ControllerExit();
-	delete callback;
-	callback = NULL;
 	//HasExited = true;
 }
 

src/simulation/Simulation.cpp

@@ -4918,12 +4918,8 @@ Simulation::Simulation():
 	memcpy(gmenu, golMenuT, sizeof(gol_menu) * golMenuCount);
 	free(golMenuT);
 
-	Element_STKM::STKM_init_legs(this, &player, 0);
-	player.spwn = 1;
-	player.elem = PT_DUST;
-	Element_STKM::STKM_init_legs(this, &player2, 0);
-	player2.spwn = 1;
-	player2.elem = PT_DUST;
+	player.comm = 0;
+	player2.comm = 0;
 
 	init_can_move();
 	clear_sim();