API demo: harvest calculator

[Skud]

Using the v0 API, write a calculator to show how much food has been harvested by a single person (or by all people) over a given time period. This should be broken down by crop type eg. "broccoli - 3kg" and also show a grand total. Presumably you would only add up those harvests which have weights, but you might list those without weights just for completeness.