forum.freeciv.org

In short: It replaced game.ruleset civstyle.civil_war_enabled.

But I guess you are right that ruleset author could also have a hugely negative Civil_War_Chance effect to cancel all positive effects, and to make sure that the civil war never occurs when requirements of that effect are fulfilled. Hmm.

Support for animated unit sprites added. RM #1480

The problem is in in fuel usage, so look for checks against building fuel using units.

First draft of changes relative to 3.2.0-beta2: https://www.freeciv.org/wiki/NEWS-3.2.0-RC1

Freeciv-3.2 changes relative to freeciv-3.1 at https://www.freeciv.org/wiki/NEWS-3.2.0

Anyway, it's not hard to get AI to build aircraft (just remove whatever guards there is protecting AI from that), but it would be very hard to get AI to use those aircrafts sensibly once it has built them, i.e., not to lose masses of them to out-of-fuel.

That handicap is set on "restricted", "novice", and "easy" difficulty level AIs.
E.g.: Higher difficulty levels do not have that handicap.

Sprites of "Cardinals" extra style can be animated. RM #1454

Trying to adjust the ruleset format as you encounter issues is one way to proceed.

Still, this document how to do ruleset update all the way from stable freeciv-3.0 format to stable freeciv-3.1 format likely comes handy: https://www.freeciv.org/wiki/How_to_upd ... 3.0_to_3.1

New requirement type FutureTechs RM #1425

It's some development, not stable, format anyway: So would not work with any stable freeciv version.