Do we need to make caching optional?

[yannikbuhl]

We cache all API calls using {memoise}. However, if one does not close her R session frequently, new data will not get fetched. This might be an issue in data with higher frequency or with the publication of the Census results in summer.

Something we have to think about.

In any case, we have to emphasise caching more strictly in the documenation and vignettes so users do not get confused.