Metabolism Precision Runtime Errors (#5701)

Because of precision issues with floating point values, metabolism would sometimes runtime and cause performance issues. This PR fixes this.

Fixes #5698 as well.

code/modules/reagents/Chemistry-Holder.dm

@@ -98,7 +98,6 @@
 //returns 1 if the holder should continue reactiong, 0 otherwise.
 /datum/reagents/proc/process_reactions()
 	if(!my_atom || !my_atom.loc || my_atom.flags & NOREACT)
-		equalize_temperature()
 		return 0
 
 	var/reaction_occured

code/modules/reagents/Chemistry-Reagents.dm

@@ -39,6 +39,7 @@
 /datum/reagent/proc/initialize_data(var/newdata) // Called when the reagent is created.
 	if(!isnull(newdata))
 		data = newdata
+	metabolism = round(metabolism,0.001)
 
 /datum/reagent/proc/remove_self(var/amount) // Shortcut
 	if (!holder)

code/modules/reagents/Chemistry-Temperature.dm

@@ -66,9 +66,8 @@
 
 	var/total_thermal_energy = 0
 	var/total_heat_capacity = 0
-	
 	var/was_changed = FALSE
-	
+
 	for(var/datum/reagent/R in reagent_list)
 		total_thermal_energy += R.get_thermal_energy()
 		total_heat_capacity += R.get_heat_capacity()
@@ -76,11 +75,10 @@
 	for(var/datum/reagent/R in reagent_list)
 		var/old_thermal_energy = R.get_thermal_energy()
 		var/new_thermal_energy = total_thermal_energy * (R.get_heat_capacity()/total_heat_capacity)
-	
-		if(old_thermal_energy != new_thermal_energy)
+		if(round(old_thermal_energy,1) != round(new_thermal_energy,1))
 			R.set_thermal_energy( new_thermal_energy )
 			was_changed = TRUE
-			
+
 	return was_changed
 
 /datum/reagents/proc/add_thermal_energy(var/thermal_energy_to_add)