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Fix bug in bin indexing for >1D Histograms

Daniel Charles Craik requested to merge dcraik/Gaudi:dcraik_accumulators_bugfix into master

Fixes an error in the determination of Histogram bin indices for non-square >1D histograms. The size of axis N-1 was used in the calculation when the size of axis N should have been used. For 2D histograms with more bins in x than y, e.g. the ECAL segmentation, this was causing a buffer overflow.

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