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improve histogram booking speed

Maximilian Emanuel Goblirsch-Kolb requested to merge MG_tuneBooking into master

Identified a bottleneck when booking very large (O(100k)) numbers of histrograms in large-scale analysis histogramming workloads. Speed up the booking using an unordered_map to help quickly locate booked plots. In bottleneck use-case, gain factor 10 in speed.

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