Allows reactions to happen with any level of the required chems

Rather than an arbitrary 1u cutoff below which reactions will not happen, reactions will now happen at whatever level of chems are present.

code/modules/reagents/Chemistry-Holder.dm

@@ -6,14 +6,14 @@
 	var/reacting = 0 // Reacting right now
 
 /datum/reagents/New(var/max = 100)
-	maximum_volume = max
+	maximum_volume = max
 	//I dislike having these here but map-objects are initialised before world/New() is called. >_>
 	if(!chemical_reagents_list)
 		//Chemical Reagents - Initialises all /datum/reagent into a list indexed by reagent id
 		var/paths = typesof(/datum/reagent) - /datum/reagent
 		chemical_reagents_list = list()
 		for(var/path in paths)
-			var/datum/reagent/D = new path()
+			var/datum/reagent/D = new path()
 			if(!D.name)
 				continue
 			chemical_reagents_list[D.id] = D
@@ -40,16 +40,16 @@
 			for(var/id in reaction_ids)
 				if(!chemical_reactions_list[id])
 					chemical_reactions_list[id] = list()
-				chemical_reactions_list[id] += D
-				break // Don't bother adding ourselves to other reagent ids, it is redundant.
-
-/datum/reagents/Destroy()
-	..()
-	for(var/datum/reagent/R in reagent_list)
-		qdel(R)
-	reagent_list.Cut()
-	reagent_list = null
-	if(my_atom && my_atom.reagents == src)
+				chemical_reactions_list[id] += D
+				break // Don't bother adding ourselves to other reagent ids, it is redundant.
+
+/datum/reagents/Destroy()
+	..()
+	for(var/datum/reagent/R in reagent_list)
+		qdel(R)
+	reagent_list.Cut()
+	reagent_list = null
+	if(my_atom && my_atom.reagents == src)
 		my_atom.reagents = null
 
 /* Internal procs */
@@ -116,7 +116,7 @@
 			for(var/datum/chemical_reaction/C in chemical_reactions_list[R.id])
 				var/reagents_suitable = 1
 				for(var/B in C.required_reagents)
-					if(!has_reagent(B, C.required_reagents[B]))
+					if(!has_reagent(B))
 						reagents_suitable = 0
 				for(var/B in C.catalysts)
 					if(!has_reagent(B, C.catalysts[B]))
@@ -169,7 +169,7 @@
 			if(!isnull(data)) // For all we know, it could be zero or empty string and meaningful
 				current.mix_data(data, amount)
 			update_total()
-			if(!safety)
+			if(!safety)
 				handle_reactions()
 			if(my_atom)
 				my_atom.on_reagent_change()
@@ -183,7 +183,7 @@
 		R.initialize_data(data)
 		update_total()
 		if(!safety)
-			handle_reactions()
+			handle_reactions()
 		if(my_atom)
 			my_atom.on_reagent_change()
 		return 1
@@ -218,7 +218,7 @@
 /datum/reagents/proc/has_reagent(var/id, var/amount = 0)
 	for(var/datum/reagent/current in reagent_list)
 		if(current.id == id)
-			if(current.volume >= amount)
+			if(current.volume >= amount)
 				return 1
 			else
 				return 0
@@ -234,12 +234,12 @@
 		if(current.id == id)
 			return current.volume
 	return 0
-
+
 /datum/reagents/proc/get_data(var/id)
 	for(var/datum/reagent/current in reagent_list)
 		if(current.id == id)
 			return current.get_data()
-	return 0
+	return 0
 
 /datum/reagents/proc/get_reagents()
 	var/res = ""
@@ -255,14 +255,14 @@
 	amount = min(amount, total_volume)
 
 	if(!amount)
-		return
+		return
 
 	var/part = amount / total_volume
-
+
 	for(var/datum/reagent/current in reagent_list)
 		var/amount_to_remove = current.volume * part
 		remove_reagent(current.id, amount_to_remove, 1)
-
+
 	update_total()
 	handle_reactions()
 	return amount
@@ -431,6 +431,6 @@
 
 /* Atom reagent creation - use it all the time */
 
-/atom/proc/create_reagents(var/max_vol)
+/atom/proc/create_reagents(var/max_vol)
 	reagents = new/datum/reagents(max_vol)
-	reagents.my_atom = src
+	reagents.my_atom = src