TG: Some work on aliens. I'll finish this up soon.

Gave riot shields a 99% chance of blocking pushers from pushing their wielders
(given their wielder is not on the help intent).

Added a projectile reflection mechanic. Ablative Armor will often, when the
groin or torso is struck, deflect projectiles back to the tile they came from
(not back the original shooter). Deflected projectiles aren't 100% accurate, so
ablative armor can result in friendly fire.

Hopefully stopped humans from waking up 1 second after they fall asleep.
Revision: r3286
Author: 	 vageyenaman

code/modules/projectiles/gun.dm

@@ -189,6 +189,7 @@
 
 		in_chamber.original = targloc
 		in_chamber.loc = get_turf(user)
+		in_chamber.starting = get_turf(user)
 		user.next_move = world.time + 4
 		in_chamber.silenced = silenced
 		in_chamber.current = curloc

code/modules/projectiles/projectile.dm

@@ -27,7 +27,8 @@
 		yo = null
 		xo = null
 		current = null
-		turf/original = null
+		turf/original = null // the original turf clicked
+		turf/starting = null // the projectile's starting turf
 
 		p_x = 16
 		p_y = 16 // the pixel location of the tile that the player clicked. Default is the center