[MERGED PR] Makes security slots scale at lower population

[BotchKing]

I think there will definitely be a transition period for this where the crew will have to deal with some problems by themselves if not enough secoffs are available. Currently on 3, any department can just call for sec and expect 2-5 officers to respond almost immediately, but this will probably no longer be the case with reduced slots.

If it means the crew has to be a bit more self-reliant on some issues, I think it's not necessarily a bad thing, but something everyone will have to get used to with time.