
    In some countries, we need to be able to make appear on an invoice a rounding line, appearing there only because the
    smallest coinage has been removed from the circulation. For example, in Switzerland invoices have to be rounded to
    0.05 CHF because coins of 0.01 CHF and 0.02 CHF aren't used anymore.
    see https://en.wikipedia.org/wiki/Cash_rounding for more details.
    