def gap_opening_extension=(value)
      v = value.split(',')
      self.gap_opening_penalty   = v.first
      self.gap_extension_penalty = v.last
    end
def gap_opening_extension=(value)
      v = value.split(',')
      self.gap_opening_penalty   = v.first
      self.gap_extension_penalty = v.last
    end
Virtual attribute setter.