Filter out "Wrote X/Y events to" printout
MooreOnline tests are sensitive to the overall accept fraction of the tested sequence. This MR fixes that (and the corresponding need for reference updates).
The reference for the mep_no_ut test was in particular not updated following some recent MR. What is interesting, but not too surprising, is that the four combinations of v2/v3 and dd4hep/detdesc all lead to a different number of accepted events (+-2 or so out of 70)
Edited by Rosen Matev