Hunting performance regression (found and fixed):

• NN with momentum (2.96 s/TF) is basically exactly the same speed as NN without (2.92 s/TF), std. dev. usually 0.01-0.02 s/TF
• Finds persistently 1% more tracks

MC checks pending: One run failed (old O2DPG version), next one is queued at GSI