placeView: Format 0 and negative altitudes nicer
Instead of just showing 0 or a value with a - sign, show the altitudes as "At sea level" and "%s below sea level" which looks a bit less "techichal".
Implements #369 (closed)
Instead of just showing 0 or a value with a - sign, show the altitudes as "At sea level" and "%s below sea level" which looks a bit less "techichal".
Implements #369 (closed)