Added Currency Support for Omani Rial

As our partner network continues to expand, we sometimes welcome a new customer who works in a currency that we have not encountered before.  It is then immediately added to the list of supported currencies, which we have maintained since the introduction of multi-currency support.  The official currency of Oman has just been added; the Omani Rial. Below is an overview of all 38 currencies that are currently supported.