Small bug fixes release
- OFF foods that are added to the foodlist, then deleted, then re-added now show up again.
- Foods can have negative energy values - useful if you want to add "exercise" food items.
- Non-nutriment stat values and averages are now calculated/displayed correctly in the statistics page.
- A couple of additional colour themes and some appearance tweaks.
- Another lazy attempt at the f-droid problem, I'll look into it more deeply when I have time.