Rad damage changes

Added coefficient to scale speed of rads. Currently it's 10x slower than it was.

Added humans going bald on high rads levels.
Added a chance to get sick burn on highest rad level.
Replaced mutations (turning deaf/blind is unfun, and slowing rads would raise the chance of it happening) with a a chance of small genetic damage.
If radiation loss is slowed down, wouldn't that make these effects have a much higher chance of happening?

What do you think about this and the weakening effect having ```if(prob(5) && prob(100*RADIATION_SPEED_COEFFICIENT))``` instead?

The others don't need to be changed, as the damage amounts are adjusted by RADIATION_SPEED_COEFFICIENT.