toString method
pretty print this thing .
Implementation
@override
String toString() {
final DateFormat formatter = DateFormat('dd-MM-yyyy');
final String formatted = formatter.format(datum);
var f = NumberFormat.currency(symbol: cur2sym(cur));
double valAsd = valuta / 100;
String result =
"$formatted ${_kminus.printname()} ${_kplus.printname()} ${sprintf("%-49s", [ desc ])} ${sprintf("%12s", [f.format(valAsd)])}";
return result;
}