Infection chance now calculated differently for airborne and contact ones.
Contact viruses spread on: infected people touching others, people touching naked infected people (clothed parts do not spread it).
Airborne viruses spread on: breathing (20% chance, then chance depending on worn clothing), coughing (now 2 tiles instead of 1)
Both types spread from mucous and blood puddles because lazy.
Fixes:
Blood and mucus now spread viruses correctly.
Lowered output of hyperzine generation syndrome, since it caused dedly ODs.
-Fixed derp with analyser.
Refactoring virus2, Part II - Viruses.
-Removed obsolete curing/resistance methods.
-Split base.dm into disease2.dm, effect.dm, helpers.dm.
