Implemented light and heavy snares.
Changed snare traps to snare kits.
Lowered spider/wolf ratio -> 3%spider, 3%wolf, 2%cougar/bear ~> 15% rabbit
Merge pull request #231 from tasetase/freq

Lowered spider/wolf ratio -> 3%spider, 3%wolf, 2%cougar/bear ~> 15% rabbit
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.
Suppress non-classic monsters and locations if classic zombie mode is enabled.
Disable eyebot/copbot event from triggering in classic zombie mode.
Alow wider-screen windows.