Ability to process transactions that report amounts in currencies other than the "Default" currency

Purpose: Users need the ability to order and pay for materials in currencies other than the currency they are reporting in.

High-Level Requirements:
Must be able to specify amounts for transactions in currencies that are not the currently the "default currency" of the system.
For an order, the exchange rate should be calculated using the sent date(order date) an ecumbrance made in the systems "Default Currency"
For a Payment the Exchange rate should be based on the payment date

(Post v1) If connected to an external accounting system this exchange rate would be updated if the system receives a receipt from an external accounting system that reports a date for the actual day of the executed transaction or a specific exchange rate/amount.