[NFP] "Appease the gods" event not scaling with game speed.

[bitula]

"Appease the gods" event not scaling with game speed, which causes permanent coastal flooding as early as medieval age on marathon game speed. This is too far away from atomic age "flood barrier" and so breaks the game in terms of both immersion and mechanics. Should be a simple fix, just divide the event probabililty by game speed factor (eg.: 4 for marathon).