some trading rules for KRX

- no IOC for short sell orders

- sunshine policy for program orders during expiration date, ie, disclose the orders by no later than 14:45 KST

- random end rules: it will be trigger when final call price deviates by more than 3% from its previous price (last price published at 14:40 KST), and the call execution time will be extended to a point (5min max) randomly decided by the trading system; this only applies on expiration date

- pre-disclosure and post-disclosure rules on expiry date