Merge pull request #7959 from phil235/AttackSelfTKFix

A bunch of fixes

code/modules/mob/dead/observer/observer.dm

@@ -3,7 +3,7 @@
 	desc = "It's a g-g-g-g-ghooooost!" //jinkies!
 	icon = 'icons/mob/mob.dmi'
 	icon_state = "ghost"
-	layer = 4
+	layer = MOB_LAYER + 1
 	stat = DEAD
 	density = 0
 	canmove = 0

code/modules/mob/living/simple_animal/simple_animal.dm

@@ -7,7 +7,7 @@
 	status_flags = CANPUSH
 
 	var/icon_living = ""
-	var/icon_dead = ""
+	var/icon_dead = "" //icon when the animal is dead. Don't use animated icons for this.
 	var/icon_gib = null	//We only try to show a gibbing animation if this exists.
 
 	var/list/speak = list()