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Implemented HistogramArray class to ease the use of arrays of histograms

Merged Sebastien Ponce requested to merge sponce_HistogramArray into master

This allows to instantiate arrays of histos in a single line, and still define custom names and titles :

  HistogramArray<Gaudi::Accumulators::Histogram<2>,10> m_tae_crate
      {this, "crate{}", "Crate {}", {3600, 0, 3600}, {3600, 0, 3600}};

will create 10 2D histograms with names/titles "crate1/Crate 1", "crate2/Crate 2", ... While :

  HistogramArray<Gaudi::Accumulators::WeightedHistogram<1>,5> m_tae_window
      {this,
       [](int n) { return ...; }, // build histo name from index
       [](int n) { return ...; }, //build histo title from index
       {11, -5, 6}};

creates 5 1D weighted histograms with custom names and titles

Units tests are provided.

Edited by Sebastien Ponce