i343_Allow a single number to be entered for the number of additional flow nodes

[LonnekevB]

…ple layers

Insert a description of your pull request (PR) here, and check off the boxes below when they are done.

---

Contributor checklist

• [ ] :tada: This PR closes #343.
• [ ] :scroll: I have broken down my PR into the following tasks:
  • [ ] Task 1
  • [ ] Task 2
• [ ] :robot: I have added tests, or extended existing tests, to cover any new features or bugs fixed in this PR.
• [ ] :book: I have considered adding a new entry in CHANGELOG.md.
• [ ] :books: I have considered updating the documentation.

[LonnekevB]

Have you tested the code with a single integer in the config?

@wouterjdb: Yes I did, it works. I guess we can change the ci configs back to single integers. Shall I make a pull request in test-data to do that?

[wouterjdb]

Have you tested the code with a single integer in the config?

@wouterjdb: Yes I did, it works. I guess we can change the ci configs back to single integers. Shall I make a pull request in test-data to do that?

Yes!