[Rivet] histograms scaling

[Anton Karneyeu]

Hi Andy,

I am looking for a way to preserve statistical information associated 
with histogram (like sum of weights, weights^2, x*weight, etc. per bin) 
after normalization/scaling step (after 
Rivet::AnalysisHandler::finalize() call). As I see, currently in Rivet 
all this information discarded - basically histogram (IHistogram1D) 
converted to an array of points (IDataPointSet).

Just to give more details - this is necessary to sum up histograms from 
different runs properly (I use Rivet as library).

Do you have an idea how to achieve this need?

Thanks,
Anton