[rel19]

This will help to find advantageous, safe and dangerous positions, where a cover and where an open space, and where good point for observation.
Currently we have to move the mouse across the screen jumping with eyes from hex to info string and back and trying to remember something.

Second reason is indistinguishable slopes under trees and buildings.

Third is that there are incorrect hexes on map which look like flat but actually are higher then adjacent flat hexes so you can not see it until point a mouse on it and check out info string. This appears in scenarios and hand made maps.