Pieces for testing and tracking status of homework checking.

EduNetworkBuilder/NB.cs

@@ -84,6 +84,7 @@ namespace EduNetworkBuilder
         Level6_NeedVLANs, Level6_SwitchedUp,
 
     }
+    public enum HomeworkSolvedStatus { NeverChecked, CheckedFailed, CheckedSucceeded }
     public enum DebugPausePoint { none=0, packet_create=1, packet_kill=2, 
         packet_in=4, packet_out=8, packet_duplicate=16, all=63, 
         dump=256, pause=512}