RBR iterator
Adds a helper function to be able to iterate over DAQ/MC events easily.
Example:
julia> rbr = RBRIterator(f)
RBRIterator(ROOTFile{OnlineTree (11405 events, 11405 summaryslices), OfflineTree (11405 events)})
julia> @showprogress 1 for (evebt, mc_event) in rbr
# ...
end
Progress: 100%|███████████████████████████████████████████████████████████| Time: 0:00:21