unknown-horizons/unknown-horizons — pull request #2116 by stubb (2013-06-02 11:57:59+00:00)
Title: Add Black Death disaster.

OLD PR: #2069
This adds a Black Death disaster, which destroys the inhabitants housings. Can be cured with medical herbs by the doctor.
Missing:
- [x] a test
- [ ] correct AI behaviour
- [x] ~~decrease happiness~~
- [x] no trading allowed with this settlement - free trader
- [x] no trading allowed with this settlement - handling for the AI

Optional:
- [ ] 90% infection rate for ships trading with an infected settlement, and again 90% chance to infect a settlement with an