Added more severe consequences of radioactivity.

A very high amount of radioactivity can actually kill you.
Added option to allow/disallow mutation by radiation.

Also some rebalancing and formatting.
Sanity check for map::apply_light_ray() to avoid lightmap hangs.
Apply transparency effects on horizontal-dominant rays as well.
Stupid error is stupid.
Merge PR #1442 - lightmap fixes
Remove unnecessary fontpath from sdlcurse code.
Merge damaging radiation and optional mutations from rads.
Merge branch 'master' of github.com:CleverRaven/Cataclysm-DDA into sdl-font-fix