docs: public final AT_Row addRow(Object ...columns) throws NullPointerException, AsciiTableException {
  		AT_Row ret = AT_Row.createContentRow(columns, TableRowStyle.NORMAL);
  
  		if(this.colNumber==0){
  			this.colNumber = columns.length;
  		}
  		else{
  			if(columns.length!=this.colNumber){
  				throw new AsciiTableException("wrong columns argument", "wrong number of columns, expected " + this.colNumber + " received " + columns.length);
  			}
  		}
  
  		this.rows.add(ret);
  		return ret;
  	}