Default map area zoom is too fine

[DaneEvans]

The default map itself is probably ok, (~10km diameter) but shows about 50 crags, many of which overlap each other making them impossible to click.

IMO the display should never be more than 10-15, and ideally with a filter that avoids making ones that are closer than the radius of the display dot.

As you zoom out to the whole of Australia, you never get to a point where you can click on a state region (nsw in particular) without it being covered by an Illawarra or sydney metro bubble.

And the long term map issue of mixed bubbles, where child bubbles are present along with their parent, and the parent still has a route count that includes the child

[bkucsera]

This will be solved with the same mode as #68