Users of ATI X-series! Look here for DEMO fix

[kenoxite]

- I couldn't find any "OcclusionTestLights" option in my main_settings.cfg file. So I left it untouched.
- Started a new game.
- The flickering _still_ occurs.
- My graphic card crashed again when that first door is opened by the wind. VPU recover saved my day again. It didn't crash with the previous fixed exe.

All this is playing in windowed mode BTW. I don't dare to run it fullscreen until/if this is get fixed, as it forces me to do a computer reboot when the card crashes.