Date_Holidays_Filter_Whitelist | --Date_Holidays_Filter_Czech_Official
By Martin Zdrahal; based on Austria/Official.php by Karin Seifert-Lorenz.
Date_Holidays_Filter_Czech_Official Date_Holidays_Filter_Czech_Official( )
Only accepts official public holidays of the Czech Republic as described on http://www.mpsv.cz/cs/74
Date_Holidays_Filter_Czech_Official __construct( )