"Payline Payment Express" Bank Import; updated how the transaction date is found

The "Payline Payment Express" Bank Import has been updated to better set the transaction date.

Previously it used the Acquired Date field, but this always seemed to be the day before the original transaction. It now uses the Settlement Date.

However, the Settlement Date field could be 1/1/1980 - a null date. If this is detected, the date will be updated to the date of the transaction being reversed, or failing that today.