Squashed 'public/modelslib/' changes from 5fb2890..9445be8

9445be8 Tortoise: Vants: smaller world for speed, 3 vants for better testing
555b175 Tortoise: Vants: work around lack of `foreach`
9c0520a Tortoise: Termites model: better settings
4fb6ebc Remove wonky climate change!

git-subtree-dir: public/modelslib
git-subtree-split: 9445be8167369d46429842e2b3bb692a35d0570f
Merge commit 'a3b9c32a52303470f54850287368825a3cb15412'
Set models library climate change as default.