[Freeciv-Dev] freeciv_hackers_guide.txt update

[Thue <thue@xxxxxxxxxxxxxxxxxxxxxxxxxx>]

I changed it where I though apropriate.
-Rewrote the genlist part, which I found hard to get through the first time 
saw it (no need to tell people how genlists used to work)
-expanded the part about the map structure.
-small changes in README.AI

-Thue

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