(Unanswered question from https://github.com/wmde/FundraisingFrontend/pull/301)

I don't like how this reads: new Euro( 1000 ). Looks like that is 1000 Euro, while it's just 10. Easy for someone to get confused. Perhaps we should make the constructor private and have newFromCents( int $i ) and newFromWholeAmount( int $i ) methods? The later could be omitted in favor of the already existing newFromFloat, which also accepts integers.