[#236] Add country rank column to overview page

This change sorts `OpenDataCensus.data.places` by score in `getAllEntrysWithInfo`. I’m not sure whether it wouldn’t be more robust to sort whenever the overview is requested?

It seems to work this way – I wasn’t able to break the ordering by submitting new data.

One advantage of sorting server-side is it removes the initial FOUP (flash of unranked places!) on the summary page.

Fixes #236.