public void AddValue(String TestName, int var, Value val)
		{
			ValueMapping mapping;
			if(!mappings.TryGetValue(TestName, out mapping))
			{
				mapping = new ValueMapping();
				mappings[TestName] = mapping;
			}
			mapping.AddValue(var, val);
		}
		internal bool TryGetValue(int var_id, out Value value)
		{
			return mapping.TryGetValue(var_id, out value);
		}
		internal void AddValue(int var_id, Value val)
		{
			mapping[var_id] = val;
		}