docs: def get_query_context_error_report(self):
      """Get a report on context-specific errors relative to what is expected on the query strand.
  
      :returns: Object with a 'header' and a 'data' where data describes context: before,after ,reference, query.  A total is kept for each reference base, and individual errors are finally checked
      :rtype: dict()
  
      """
      report = {}
      report['header'] = ['before','after','reference','query','fraction']
      report['data'] = []
      r = self.get_query_context_errors()
      for b in sorted(r.keys()):
        for a in sorted(r[b].keys()):
          for t in sorted(r[b][a]):
            for q in sorted(r[b][a]):
              v = 0
              if r[b][a][q]['total'] > 0:
                v = float(r[b][a][q]['types'][t])/float(r[b][a][q]['total'])
              report['data'].append([b,a,t,q,v])
      return report