Modify MessageFactory interface to add a functionality to create a group based on an enclosing message and group type

    /**
     * Creates a group for the specified parent message type and
     * for the fields with the corresponding field ID
     *
     * Example: to create a {@link quickfix.fix42.MarketDataRequest.NoMDEntryTypes}
     * you need to call
     *       create({@link quickfix.field.MsgType#MARKET_DATA_REQUEST, {@link quickfix.field.NoMDEntryTypes#FIELD})
     *
     * @param msgType   Message type of the enclosing message
     * @param correspondingFieldID  the fieldID of the field in the group
     * @return  group
     */
    public Group create(String beginString, String msgType, int correspondingFieldID);