Check if a currency corresponds to a country.
((To USD/CurrencyCheck|FRA|DEM))
returns 0.
((To USD/CurrencyCheck|FRA|FRA))
returns 0.
((To USD/CurrencyCheck|FRA|FRF))
returns 1.
((To USD/CurrencyCheck|FRA|EUR))
returns 1.
((To USD/CurrencyCheck|FRA|))
returns 1.
((To USD/CurrencyCheck|FRA))
returns 1.