[Freeciv-Dev] (PR#8890) Removal of free city center

["James Canete" <use_less@xxxxxxxxxxx>]

<URL: http://rt.freeciv.org/Ticket/Display.html?id=8890 >

I tweaked this patch a bit more.  With city center disabled and minimum
city center food set to default, savegames match.

Changes:
- altered all references to MAX_FIELDS_USED in cm.c by removing "+ 1". 
This fixes loading saves.
- re-enabled minimum city center production values from ruleset.
- Set minimum city center food production to 4, and removed extra two food.

Issues:
- This patch removes the "magic" two food, and pretty much forces the
city to work the center tile if the city is to grow.

-James Canete

my_no_free_city_center-4.diff
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