Next Subgroup Operation

Next subgroup is a selection operation that changes the selection focus to the next subgroup.

It is important to the following operations:

issue stimpack with a selection containing ghosts and/or ravens and/or battlecruisers

train units out of selections of barracks and factories etc. or gates/warpgates/robo/stargate

issue corruption with a selection containing ultralisks and/or vipers and/or infestors and/or queens and/or swarm hosts (isn't it faster to ctrl-select corruptors?)

but most important of all:

remove units from the current selection using uip-deselect.