Unit tests for scripts

Relevant to  #569

@memimo @Menerve Here are some unit tests for the scripts folder. I wasn't sure how to test them, but I figured one way was just to call them the same way the user would (from the command line). This should also make sure that changes to the CLI are tested.

* I deleted the `wiskott.yaml` file, I couldn't find any use for it
* I fixed some formatting and docstring issues and removed those files from the whitelist
* `hcae.yaml` has two costs arguments, and the test for it crashes because of it. I'm not sure which cost to keep.
* I added a small pickled MLP so that I can test the scripts on it.