Simplified update_mutations_overlay(), we no longer rebuild the entire mutation layer with all mutations every time we get or lose a mutation. I reintroduced in on_acquiring and on_losing some code similar to the old lose_indication gain_indication procs.

Fixed lesser form changeling, when humanized via dna injector, the ling no longer keeps its Human Form power.

Simplified the racemut trick in humanize() and monkeyize().

Dna now gets qdel'd, just like reagents, when the mob gets qdel'd.

Some tiny fixes here and there.

Added a changelog.

code/modules/events/radiation_storm.dm

@@ -43,10 +43,9 @@
 			if(prob(25))
 				if(prob(75))
 					randmutb(H)
-					H.domutcheck()
 				else
 					randmutg(H)
-					H.domutcheck()
+				H.domutcheck()
 
 		else if(istype(C, /mob/living/carbon/monkey))
 			var/mob/living/carbon/monkey/M = C

code/modules/events/wizard/imposter.dm

@@ -21,6 +21,7 @@
 		I.real_name = I.dna.real_name
 		I.name = I.dna.real_name
 		I.updateappearance(mutcolor_update=1)
+		I.domutcheck()
 		if(W.ears)		I.equip_to_slot_or_del(new W.ears.type, slot_ears)
 		if(W.w_uniform)	I.equip_to_slot_or_del(new W.w_uniform.type	, slot_w_uniform)
 		if(W.shoes)		I.equip_to_slot_or_del(new W.shoes.type, slot_shoes)

code/modules/mob/living/carbon/carbon.dm

@@ -22,6 +22,8 @@
 	for(var/atom/movable/food in stomach_contents)
 		qdel(food)
 	remove_from_all_data_huds()
+	if(dna)
+		qdel(dna)
 	return ..()
 
 /mob/living/carbon/Move(NewLoc, direct)

code/modules/mob/transform_procs.dm

@@ -48,8 +48,8 @@
 
 	if(tr_flags & TR_KEEPSE)
 		O.dna.struc_enzymes = dna.struc_enzymes
-		var/datum/mutation/human/race/R = mutations_list[RACEMUT] //we don't want to keep the race block inactive
-		O.dna.struc_enzymes = setblock(O.dna.struc_enzymes, R.dna_block, random_string(DNA_BLOCK_SIZE, list("8","9","a","b","c","d","e", "f")))
+		var/datum/mutation/human/race/R = mutations_list[RACEMUT]
+		O.dna.struc_enzymes = R.set_se(O.dna.struc_enzymes, on=1)//we don't want to keep the race block inactive
 
 	if(suiciding)
 		O.suiciding = suiciding
@@ -166,8 +166,8 @@
 
 	if(tr_flags & TR_KEEPSE)
 		O.dna.struc_enzymes = dna.struc_enzymes
-		var/datum/mutation/human/race/R = mutations_list[RACEMUT] //we don't want to keep the race block active
-		O.dna.struc_enzymes = setblock(O.dna.struc_enzymes, R.dna_block, random_string(DNA_BLOCK_SIZE, list("0","1","2","3","4","5","6")))
+		var/datum/mutation/human/race/R = mutations_list[RACEMUT]
+		O.dna.struc_enzymes = R.set_se(O.dna.struc_enzymes, on=0)//we don't want to keep the race block active
 		O.domutcheck()
 
 	if(suiciding)
@@ -208,6 +208,10 @@
 
 	if(mind)
 		mind.transfer_to(O)
+		if(O.mind.changeling)
+			for(var/obj/effect/proc_holder/changeling/humanform/HF in O.mind.changeling.purchasedpowers)
+				mind.changeling.purchasedpowers -= HF
+
 	O.a_intent = "help"
 	if (tr_flags & TR_DEFAULTMSG)
 		O << "<B>You are now a human.</B>"