public void rewind(){
synchronized (used) {
    for (    ParameterPair pair : used) {
      current.addParameter(pair.option,pair.value);
    }
    used.clear();
  }
}

public void rewind ( ) { synchronized ( used ) { for ( ParameterPair pair : used ) { current . addParameter ( pair . option , pair . value ) ; } used . clear ( ) ; } }
rewind the configuration to the initial situation
