Improved brainloss effects.

- Will drop items/fall down with a lot of brainloss now, headache and blurry vision with small brainloss.
- Removed stupid effects, like random messages and headbutting airlocks.
- Cloning now will leave you at lower health and cause small amounts of brainloss.
Forgot to save airlock.dm before committing.
Headrevs now get the names of 3 people who might be convertible.
Merge pull request #2503 from CIB/feature

Improved brainloss effects.