removed ART testers firstevent parameter
removed the --firstevent parameter from the Gen_tf.py option as it is by default start from the first event and it make more sense to start with 1 instead of -1
Edited by Luzhan Yue
removed the --firstevent parameter from the Gen_tf.py option as it is by default start from the first event and it make more sense to start with 1 instead of -1