[x] allow for more than 2 children by either extending official data on Bedarfsgemeinschaften or by dropping use of official data
[ ] allow for easier specification of variables which are constant within households via broadcasting (i.e. allow for mietstufe: 2 instead of mietstufe: [2, 2, 2, 2]
mietstufe: 2
instead ofmietstufe: [2, 2, 2, 2]