[Freeciv-Dev] PATCH: New version of production fix. (PR#694)

[Joona Kiiski <zamar@xxxxxxxxxxxxxx>]

Fixes the production problems mentioned in my earlier message +
Fixes the bugs Thue mentioned in my patch

Changes:
- Fixed prototype for nullify_caravan_and_disband_plus()
(What a silly mistake :)

-AI now uses server's disband functions.
Those functions modified a bit.

-Added new function nullify_prechange_production, which calls
nullify_caravan_and_disband_plus (static). Cosmetic change.
Should make things a bit less complicated.

-Added enum for unit/wonder/building stuff.

--
Zamar

fix_prod_problems_upg.diff
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