[Rivet] setSumOfWeights

[Silvan Kuttimalai]

Dear Rivet Authors,

we noted that in Rivet version 2.6.0 the method 
AnalysisHandler::setSumOfWeights is not present anymore. We used this 
method in Sherpa in order to automatically split up our rivet analysis 
output by contributions from H and S events in MC at NLO for example. To 
get the normalization of these sub contributions right, we set the sum 
of weights explicitly at the end of the run. Is there an alternative for 
this procedure in the new version?

Many thanks,
Silvan