This adds a debonus to the range of melee units when standing higher or lower.
Not sure whether anyone would like this in or not, but it works and is realistic.
(Probably noone wants it in: it gives no noticable difference in attack range and when it would be, players might not understand where the difference comes from. But since I already uploaded the patch earlier, I'll keep it open. Feel free to close as won't be in, as appropriate.)