add methods for PSD2  & COF
add methods for PSD2  & COF

Add 3 methods:
setMerchantCofIni : for parameter DS_MERCHANT_COF_INI
setMerchantCofType : for parameter DS_MERCHANT_COF_TYPE
setMerchantCofTxnid : for parameter DS_MERCHANT_COF_TXNID
ssheduardo/sermepa