Prevent poachers that would be terrible shots.

Non-aggresive hostile travellers/caravans should not be considered and active threat, and prevent friendly "raids" from attacking them.

Minor fix to checking if a raid can be started.

- Treat surprise attacks properly as separate incidents.

- Add surprise attacks.
- Make poachers/loggers leave if they become non-hostile.

- Require certain minimal plant skill for logging.

- Prevent non-humanoids taking part in poaching and logging.
- Try to prevent weapons poorly suited for poaching.

Fix Harmony requirement for the 1.6-based version.

Fixed translations for versions older than 1.6.

Updated for 1.6.