NetClass append(BrdLayerStructure p_layer_structure,ClearanceMatrix p_clearance_matrix,IteraBoard itera_board){
  GuiResources resources=itera_board.newGuiResources("rules.resources.Default");
  String name_front=resources.getString("class");
  String new_name=null;
  Integer index=0;
  for (; ; ) {
    ++index;
    new_name=name_front + index.toString();
    if (get(new_name) == null)     break;
  }
  return append(new_name,p_layer_structure,p_clearance_matrix);
}

NetClass append ( BrdLayerStructure p_layer_structure , ClearanceMatrix p_clearance_matrix , IteraBoard itera_board ) { GuiResources resources = itera_board . newGuiResources ( "rules.resources.Default" ) ; String name_front = resources . getString ( "class" ) ; String new_name = null ; Integer index = 0 ; for ( ; ; ) { ++ index ; new_name = name_front + index . toString ( ) ; if ( get ( new_name ) == null ) break ; } return append ( new_name , p_layer_structure , p_clearance_matrix ) ; }
appends a new empty class to the class array . a name for the class is created internally
