Some tests that were changed, where I am unsure about the change.
These have been marked with "TODO: check, ...".

These are:

- `test/nature_tests.jl`, lines 113-117:
```
    @test_logs((:warn, "There are not enough suitable locations for Mermaid in the landscape."),
               (:info, "Initialised 6 Mermaids."),  # TODO: check, used to be '5 Mermaids'
               Ps.initpopulation!(Ps.Mermaid, initparams4, model))
    @test Ps.countanimals((1,1), model, radius=40m) == 0
    @test Ps.countanimals((6,4), model) == 6  # TODO: check, used to be 5
```

- `test/landscape_tests.jl`, line 12:
```
    @test Ps.landcover((300,1), model) == Ps.grass  # TODO: used to be `Ps.soil`, check this
```