code: public GenerationFileHandler rotate(String storeSuffix,
              String activeSuffix)
      throws IOException {
          return rotate(storeSuffix, activeSuffix, false);
      }
docs: Move the current file to a new filename with the storeSuffix in place
  of the activeSuffix; continuing logging to a new file under the
  original filename.
  
  @param storeSuffix Suffix to put in place of <code>activeSuffix</code>
  @param activeSuffix Suffix to replace with <code>storeSuffix</code>.
  @return GenerationFileHandler instance.
  @throws IOException