Updates mapdata.cpp for stone walls.
Tiles.
mapdata.h
Missing initializer.
Merge branch 'updates-mapadata-cpp-for-stone-walls' of https://github.com/Rivet-the-Zombie/Cataclysm-DDA into Rivet-the-Zombie-updates-mapadata-cpp-for-stone-walls
Merge branch 'master' of https://github.com/CleverRaven/Cataclysm-DDA