Remove "by human beings" from Law 2

[Superlagg]

It's currently in a weird place, nonhuman crew and to be slilicons. On one hand they aren't supposed to be considered human. On the other, they aren't allowed to hurt them on default laws, and nonhumans can be in command roles.

I want to be treated like some kind of alien, but I also want it to make sense, and also not accidently let the AI side with changers and vompers.