[Freeciv-Dev] AI can build railway-system

["mateusz stefek" <matusik_s@xxxxx>]

Here comes new PATCH wchich doesn't assume that MOVE_COST_RAIL == 0

struct tile
{
...
+  struct tile* rail_zone;
};

It adds extra 4 bytes per tile, but defines function
+int is_tiles_rail_connected(int x0, int y0, int x1, int y1);
which quickly checks wheather two tiles are in the same "rail zone"
It could be used in AI evaluating cities, and many other places.

BTW
I found it easier to konquer AI when they have railway-system in their country.
And it is sad.

---
mateusz

railway-system.diff
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