Disease.cpp fixes
Tweaked pain due to heat
Lowered homeostasis adjustement while hot
Remove obsolete, unused skill-related members of player class
Remove obsolete sklevel member from player class
Nuke some commented out debug code.
Add new anchor point flag and apply it to car seats.
Require an anchor point to be present to install a seatbelt.
Add a saddle item and vehicle part for bicycles and motorcycles.
It is smaller and lighter than a car seat, but cannot have a seatbelt attached.
Incidentally it also can't hold tems dropped on it.
Add a debugmsg call when generating ot_null terrain
Extract ot_null generation to a helper method
Add a proper struct for passing around neighbor data
Use the helper files for helper functions
Add strings describing how different matrials take damage to material_type.
Apply new damage verbs to feedback when armor is damaged.
Remove HP reference from bite attack.
Extract mapgen to helper methods, up to ot_forest_water
Refactor game::fire() to behave sensibly about trajectories.
Add noise when moving furniture.
Vehicle collisions no longer become insane ping-pong fests that generate
velocity out of nowhere: vector changes now derived from equations at
http://en.wikipedia.org/wiki/Elastic_collision