[Freeciv-Dev] PATCH: common/city.c

[Tony Stuckey <stuckey@xxxxxxxxxxxxxxxxx>]

        When calculating trade produced in a square, Civ1 calculates
railroad trade effects before governmental trade effects.  This patch fixes
this.  If Civ2 does it differently, that needs to be protected by a
game.civstyle test.

        This patch also streamlines other trade production math.  Working
the numbers shows that many calculations could be avoided for squares that
generate no trade.
-- 
Anthony J. Stuckey                              stuckey@xxxxxxxxxxxxxxxxx
"When I was young, the sky was filled with stars.
 I watched them burn out one by one."  -Warren Zevon

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