[FIX] account: exchange difference date and amount

The use case is the following: the currency of a customer invoice (e.g.
EUR) is different from the currency of the company (e.g. USD). An
invoice is created in EUR, and a payment is done in EUR on the
receivable account which is in EUR.

Between the invoice date (e.g. 2015-01-01) and the payment date (e.g.
2015-02-01), the rate has changed. The reconciliation between the
invoice and the payment is done afterwards, for example 2015-03-01.

When the write-off related to the exchange difference is created:
- the date should be the max date between payment and invoice if the
  corresponding fiscal year is not closed (otherwise, today's date).
- the amount currency on the receivable/payable account should be zero,
  since the amount currency on the foreign exchange account is zero.

opw-659289

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