code: def get_status_cols(self, section):
          
          colours = dict()
          for s_name in self.fastqc_data:
              status = self.fastqc_data[s_name]['statuses'].get(section, 'default')
              colours[s_name] = self.status_colours[status]
          return colours
docs: Helper function - returns a list of colours according to the FastQC
          status of this module for each sample.