Overdose mini-patch

Stops sleepers giving people overdose amounts.
More virology symptoms

Pain symptoms, and more antidepressant producing viruses.  Made a change
to the most powerful antidepressant, to make it break their mind more
often if over 5 units, to simulate overdosing of this potent chemical
Merge pull request #321 from Bone-White/master

Overdose mini-patch