[Run2_2017] Update XS and k-Factors
Created by: aperloff
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Update the year-by-year XS and k-factor values. Values taken from XSDB, https://twiki.cern.ch/twiki/bin/viewauth/CMS/SummaryTable1G25ns, and GenXSecAnalyzer.
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Make sure the k-factors are propagated to the weightProducer XS value.