[Rivet] Two-dimensional histograms

[James Robinson]

Dear experts,

I would like to fill a 2D histogram in Rivet's analyze() function, which I
then turn into a 1D histogram during finalize(). This would be done by
iterating along the x-axis and calculating y_bin[0] / (y_bin[0] +
y_bin[1]). It's basically an efficiency histogram, but there doesn't seem
to be an existing class that can handle this natively. However, naively
using bookHisto2D and Histo2DPtr analogously to Histo1D doesn't work: these
types don't seem to exist.

How would you suggest I go about making the histogram that I need using
Rivet 2?

Thanks,
James
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