Change the way total cross section is computed in GenXSecAnalzyer and fix the print out in LHERunInfo.cc #7674
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GenXSecAnalyzer: when computing the total cross section after jet matching, instead of multiplying the
jet matching efficiency with individual cross section first and adding up the cross section from each process
later, now we add the cross section before matching first and multiply this cross section with the total jet matching efficiency.
LHERunInfo.cc: previous version did not include the process that has zero jet matching efficiency when computing the total jet matching efficiency. It is fixed now.
The threshold of 1e-6 has been modified to zero too.