User preferences are now saved when Oolite under GNUstep exits.

git-svn-id: http://svn.berlios.de/svnroot/repos/oolite-linux/trunk@1230 127b21dd-08f5-0310-b4b7-95ae10353056

src/Core/GameController.m

@@ -843,6 +843,8 @@ static int CompareDisplayModes(id arg1, id arg2, void *context)
 
 - (void) exitApp
 {
+	[[NSUserDefaults standardUserDefaults] synchronize];
+	OOLog(@"gameController.exitApp",@".GNUstepDefaults synchronized. Exiting.");
 	OOLoggingTerminate();
 	SDL_Quit();
 	exit(0);