Updates prices for alcohol

Also fixes spiced mead's weight
Reduce barrel prices to 0

Some stuff might generate in them (plus a 30 gallon barrel is not worth
5000 bucks), so until someone gives them a proper price, they shoul be
worth 0 like other containers.
Fixes descriptions
Price note for single malt whiskey

shouldn't throw off future readers!
Merge pull request #6495 from 9600bauds/prices_alcohol

Updates prices for alcohol.