So, if I try to run a co-refinement, where I have more than one fit contribution, generally the recipe building goes fine. But, I if call something like `FitResults(recipe).printResults()` I get: ``` ... AttributeError: 'odict_keys' object has no attribute 'sort' ``` Something similar occurs if I call `recipe.setWeights` I think this is because dictionary keys/values etc are being treated as lists (python 2) I'll see if I can fix it.