code: private void setSecStrucType(int pos, SecStrucType type){
  		SecStrucState ss = getSecStrucState(pos);
  		if (type.compareTo(ss.getType()) < 0) ss.setType(type);
  	}
docs: Set the new type only if it has more preference than the
  current residue SS type.
  @param pos
  @param type