Implement jelly/pickles support

[amterp]

Take into account how many preserves jars the user has, determine (or ask?) how many 'cycles' of pickle/jelly producing the user should do, then return the order in which the vegetables should be put in the preserves jar.

• Should this only be given if the user inputs that it should? As opposed to simply giving the values on the same screen as the 'shopping list'?
• Should it work by the user entering the vegetables/fruits they have on inventory (or that they'll have at the end of a harvest-round) and then be given the order in which to put them into the preserves jar?