Keg hop addition option

[rudylyon57]

While not used for net IBU rollup, having an option for keg-hopping, along with boil, whirlpool, dry hop, etc would be nice for recipe documentation sake. Not sure of other brewers but I use this hopping method frequently.

[BOB357]

Not sure what others do, but to keep track of keg hoppng for future referencing in a recipe, I designate it as dry hop 0 days.