document all possible transaction "type" codes

Provided on request by Bankwest.  The raw list is as follows:

    EVNT_TYP_CDE_C EVNT_TYP_X
    -------------- ----------------------------
    *** *********************************************
    ___ CHQ CHEQUE
    ___ CRI CREDIT INTEREST
    ___ DAT ATM DEPOSIT
    ___ DAU DEBIT AUTHORISATION
    ___ DEC EXPRESS COMMERCIAL DEPOSIT
    ___ DEP DEPOSIT
    ___ DFD FAST DEPOSIT BOX DEPOSIT
    ___ DIC DISHONOURED CREDIT
    ___ DID DISHONOURED DEBIT
    ___ DRI DEBIT INTEREST
    ___ DRR DEBIT REVERSAL
    ___ ENQ BALANCE ENQUIRY
    ___ FEE FEE RAISING
    ___ FER FEE REFUND
    ___ NAR NARRATIVE
    ___ PAD ATM DEPOSIT
    ___ PAY PAYROLL
    ___ PEN PENSION
    ___ PPA POS PAYMENT AUTHORISATION
    ___ TAC GOVT TAX ADJUSTMENT - CREDIT
    ___ TAX GOVT TAX RAISING
    ___ TFC TRANSFER - CREDIT
    ___ TFD TRANSFER - DEBIT
    ___ TFN TFN RAISING
    ___ WDC WITHDRAWAL-MC DEBIT CARD-AU
    ___ WDI WITHDRAWAL-MC DEBIT CARD-INTL
    ___ WDL WITHDRAWAL