def overview_html_hash(evaluation, less)
      data = [@overview[:scores].group_by { |a| a }.map do |k, vs|
        { 'key': k, 'value': vs.length, 'main': false }
      end]
      { data: data, type: :simplebars, aux1: 10, aux2: '',
        title: 'Overall GeneValidator Score Evaluation', footer: '',
        xtitle: 'Validation Score', ytitle: 'Number of Queries',
        less: less, evaluation: evaluation }
    end
def overview_html_hash(evaluation, less)
      data = [@overview[:scores].group_by { |a| a }.map do |k, vs|
        { 'key': k, 'value': vs.length, 'main': false }
      end]
      { data: data, type: :simplebars, aux1: 10, aux2: '',
        title: 'Overall GeneValidator Score Evaluation', footer: '',
        xtitle: 'Validation Score', ytitle: 'Number of Queries',
        less: less, evaluation: evaluation }
    end
make the historgram with the resulted scores