CleverRaven/Cataclysm-DDA — pull request #4753 by atomicdryad (2013-11-29 08:55:22+00:00)
Title: Mapgen sanity spinoffs

mongroup: provide non-autovivicating means of validity checking.
item_groups.json: guns_with_ammo boolean to replace hard-coded if group == "livingroom" || "behind_counter"
mapgen place_spawns/items: implement the above and _whine_ instead of spitting out null_item or who knows what

item factory load: use global body_parts string-to-int map, nuke
set_bitmask_by_string(...) as it was only used by set_flag_by_string(...),
and casting body_parts to map no workie.
Also eliminate std::string init frenzy via const std::string & args