Sleeper and odysseus fixes

* Sleeper and mech sleeper now detect brain and clone damage (only a message, not giving actual numbers). 
* Sleeper and mech sleeper no longer give total health percentage once patient is dead (similar to health analyzer). ( probably fixes #470 )
* Sleeper health bar no longer full and green when patient is dead or below 0 health (now empty in both cases).
* Odysseus medical hud no longer shows an "ill" icon on people with only beneficial/neutral viruses.