Appending currency symbol in CSV import

[ShrykeWindgrace]

Currently, when the field currency is set, the symbol get prepended, according to the current documentation currency field:

currency sets a currency symbol, to be prepended to all postings' amounts.
...

There's quite a list of currency symbols that are appended to the amount; e.g. Swiss francs or kronas in scandinavian countries.

It would be useful to have a field currencyAppend or some other name (I have a writer's black and can't find anything elegant) for such cases. One can also introduce currencyPrepend and make the now-active currency a synonym of the latter. Similarly for currencyN, of course.