Invalid gardens desirability calculation.

[Cherry Soup]

What in remake:
http://i.imgur.com/48FmqF4.png (1285х825 image alert!)
E.g. small garden = small spread of small desirability, big garden = big spread of 4x bigger desirability.
What in original Caesar III:
http://i.imgur.com/qoUeHdT.png (1920x1080 image alert!)
E.g. garden spread always = 3, but desirability calculates around quantity of gardens near the cell. But full algorithm of calculating I don't fully understand. There are more complex rules, than "how many gardens around". And 2x2 garden in fact just a visual effect, and not provide additional desirability.

[dalerank]

fix #298. gardens desirability work more correctly such original game)

→ <<cset 6c0ccab45c00>>

[dalerank]

fix #298. Set desirabilty for gardens like original game.

→ <<cset 91675a064297>>