Implemented light and heavy snares.
Changed snare traps to snare kits.
switch overmap to full 3d stack
shift out mongroups to z-level code, re-add bits that where disabled during switch over
slight speed up in world generation, and a popup because it takes so long
prefix is filename not directory
fixed segfault, sped up generation and maps
fix for merged change not having z-axis data
removed unknown function, something I broke during merge I think
fix notes display for z-level code
update to stop cycling layer data so much
TERMX/Y, VIEWX/Y are now global. More centering.
Updated changelog
Merge commit 'bc9b0f9' into dda-master

Conflicts:
	crafting.cpp
	itypedef.cpp
Merge commit 'cababa6' into dda-master

Conflicts:
	overmap.cpp
Spelling correction.
Add a category flag to mtypes.
Add classic zombies option.
Add classic flag to overmap specials.
Refactor MonsterGroupManager::GetMonsterFromGroup() to allways accept a reference to the mtype vector.