Extend Bitarchive code, so WARC-records can be retrieved from archive

public BitarchiveRecord(WARCRecord record) {
        ArgumentNotValid.checkNotNull(record, "WARCRecord record");
        //fileName = record.getMetaData().getArcFile().getName();
        offset = record.getHeader().getOffset();
        length = record.getHeader().getLength();
        fileName = (String) record.getHeader().getHeaderValue(WARCRecord.HEADER_KEY_FILENAME);
        ....
    }

public static byte[] readWARCRecord(WARCRecord in) throws IOException {..}