NutritionTools doesn't like Tibbles

[TomCodd]

If passed a tibble, a lot of the comments will mess up. instead of appending a new comment to the comments column, for each row it will print the entirety of the comments column (for every row), then adds the new comment. And then the row after that will do the same - so two copies of the comments column, then a new comment. ANd so on and so forth.

Caused issues in summary-table-production as some of the old functions used tibbles.