Make nEventsPerJob obligatory in top-level jO

Because if nEventsPerJob is set in the control file, the transform takes it from there and all local tests pass while ProdSys would set it equal to 10k (it reads it ffrom the top-level jO and executes Gen_tf.py with --maxEvents)

Add check to

• make this obligatory in the file
• convert warning in logParser to error