code: protected WARCRecord createArchiveRecord(InputStream is, long offset)
      throws IOException {
          return (WARCRecord)currentRecord(new WARCRecord(is,
          	getReaderIdentifier(), offset, isDigest(), isStrict()));
      }
docs: Create new WARC record.
  Encapsulate housekeeping that has to do w/ creating new Record.
  @param is InputStream to use.
  @param offset Absolute offset into WARC file.
  @return A WARCRecord.
  @throws IOException