Code review comment for lp:~tapaal-contributor/tapaal/load-and-save-time-and-game-net-properties

We need to change the method checking if a net is timed. At the moment, if there are no time intervals but the net has urgent transitions or age invariants, it will be still declared as "untimed" which we don't want anymore. So change the definition of untimed such that it will also check whether the net has urgent transitions or age invariants (except for the trivial one < infty), and if yes then report the net as timed.