Improvements to borders on Google Maps

There are a few new visual tweaks that have just gone live on Google Maps:

- Cleaner rendering of country borders, making them look less blurry
- Less prominent rendering of province borders in France, making it easier to distinguish countries/provinces and follow roads
- Better road thinning in France, making it easier to tell major from minor roads
- Improved label density, making the map more legible by removing minor cities from far zooms following the less is more rule :-)