added setting to hide zero costs with dashes

Models/UserConfig.cs

@@ -7,6 +7,7 @@
         public bool UseMPG { get; set; }
         public bool UseDescending { get; set; }
         public bool EnableAuth { get; set; }
+        public bool HideZero { get; set; }
         public string UserNameHash { get; set; }
         public string UserPasswordHash { get; set;}
     }