add smoke & fire damage to TileEngine::explode() vs. UNCONSCIOUS

	- also do damage instead of instaKill w/ DT_HE

Xcom1Ruleset: remove default armor value for Pistol
	- what's with Pistol Clip?
TileEngine: also, increase damage vs HunkerDown from 65% to 70%
BattleUnit: set default=true for setTakenExpl()
	- damage(), don't let unconscious units scream.
BattleItem: init pointers to NULL

formatting ...