Paulo Bruno

Improve unit tests

3

So far the tests are restricted to check if scenarios and figures codes run.

Automatically plot overlapping figures over the original ones

2

Inspired by the really nice [overlap figure](https://github.com/cvanwynsberghe/pyworld3/blob/main/img/result_standard_run.png) from @cvanwynsberghe in his [Python implementation of World3](https://github.com/cvanwynsberghe/pyworld3), we can create similar ones manually. It would be nice to automate the process for...

As mentioned in #18, the current way to change an equation is by printing the list of equations, getting the index of the one we would like to edit, and...

A template will make it easier for external collaborators to create issues and pull requests containing all needed information.

At the moment, the `atol` value in the [switch function](https://github.com/natema/WorldDynamics.jl/blob/f5c6f9fc4f16526ecd769607f7026d5b91ed1564/src/functions.jl#L49) is arbitrary. We should compute a proper value.