fixes #6005 and broken ancient human low/high pressure code.

-fixes low/high pressure not damaging unsealed/damaged spacesuits.
-refactors procs and adds more comments.
-removes unused/dead code.

code/game/objects/items/devices/suit_cooling.dm

@@ -42,7 +42,7 @@
 	
 	var/mob/living/carbon/human/H = loc
 	
-	var/efficiency = H.get_pressure_protection()		//you need to have a good seal for effective cooling
+	var/efficiency = 1 - H.get_pressure_weakness()		//you need to have a good seal for effective cooling
 	var/env_temp = get_environment_temperature()		//wont save you from a fire
 	var/temp_adj = min(H.bodytemperature - max(thermostat, env_temp), max_cooling)