* master: (36 commits)
  Update CHANGELOG
  Improve printCounter helper and fix counter title format
  tidy up spelling, use anonymous namespace
  Apply 1 suggestion(s) to 1 file(s)
  Refactored MessageSvcSink::printCounter using fmt library
  Apply 1 suggestion(s) to 1 file(s)
  Fixed compilation issues with Histograms using clang
  Added new syntax for histogram updates
  Adapted ref files
  Better values for profile histos in the examples
  Addressed more comments from code review
  Fixed formatting
  Added title to each axis of histograms. Default is empty
  Added title to histograms, separate from name
  Better version of ROOT Sink for Histos, credits to Gerhard
  Addressed comments after first code review of Histogram counters
  Removed ROOT and Boost histogram prototypes
  Implemented a toy ROOT histogram Sink for new monitoring
  Implementation of histograming counters
  Increased genericity of AccumulatorSet in view of implementing ProfileHitogramingCounters
  ...