v3.14.20 — the Icelandic króna, and charging prices are no longer capped at 9.99

The Icelandic króna, and charging prices are no longer capped at 9.99 (discussion #265, asked by @alloutnow).

Iceland — and Japan, Korea, Hungary — prices electricity in tens or hundreds of currency units per
kWh, but the charging-price fields refused anything above 9.99, a ceiling that only ever suited
euro/dollar-scale tariffs. That cap is gone (the 0 floor and decimal entry stay), so an
ISK/JPY/KRW/HUF tariff goes in exactly as typed. The Icelandic króna (kr.) is now in the
currency list.

And every amount now shows at least two decimals, even for zero-minor-unit currencies (ISK, JPY,
KRW, HUF): collapsing to whole units would round the figure on screen, and Mate shows the number in
full.