bring back head swapping

[Lady Birb]

I remember a time I was playing Medical Doctor and had recovered both the head and body of someone who had been decapitated. As the body had been preserved, I assumed I could reattach the head and clone him. Instead I spent ten minutes hitting the empty space where his head used to be with his head wondering why it wasn't letting me reattach it while repeatedly alt-tabbing to the wiki, which still had instructions for reattaching heads. Going off the fact that is still there, I am guessing it's removal was a bug.