Refactor RecipesForm to support predefined recipe combinations

Discussed with @pameeela and this is not a stable blocker. Still a good idea, but phew!

This should definitely be a feature of this project.

phenaproxima → closed merge request !382

Decided to do this now, before tagging anything, since this would affect the way the generated info file looks.

Automatically closed - issue fixed for 2 weeks with no activity.