Suggestion: counting unoccupied hexes

[Regerr]

There is one thing I lack on the player display: checking how many hexes are unoccupied on maps.

This is especially useful:
- if you have the scoring card on "empty hexes" (6 empty hexees = +1; 12 hexes = +2 etc.)
- to check whether opponents are about to score the 7 points bonus for complete map
- to anticipate some final move combos
And probably more

I often find myself counting empty hexes on all maps so that a tracker would be nice.

Thanks!