Also backtracked the removal of wesnoth.get_recall_units, which is now available as wesnoth.units.find_on_recall - it's just more convenient than passing x=recall to wesnoth.units.find
The relative ranking of the CA scores is not changed, except for one case when two CAs had the same score.
Reasons:
- All scores should be lower than the scores of the default Goto CA (200,000) and the default scores of most Micro AIs (300,000).
- Break tie, resulting in uncertain order of execution, of place_healers and retreat_injured CA. Healers should be placed first, to allow retreating injured units to adjacent hexes.
- Set default for generic_recruit_engine to slightly above default AI recruiting score. That way it takes effect even if the default CA is not removed.
- Increase move_to_any_enemy CA score from 1 to 1,000. It is still the lowest score that way, but allows for setting up custom CAs with even lower scores (even if it is just for end-of-turn statistics or the like).
(cherry-picked from commit 35ba82050954c2cee86321e05d6706993c08e143)
Now that all the AIs use external CAs, there is no need to use the persistent 'data' variable any more, unless information is to be exchanged between different CAs or is supposed to be persistent across save/load cycles.
(cherry-picked from commit 3bfd59f28ba7f70a6ac32782e98cba9ca6c2a44a)
