added notice for when generated metadata does not need to be written

chunkymap-regen.py

@@ -361,5 +361,7 @@ if os.path.isfile(mtmn_path) and os.path.isfile(colors_path):
         outs.write("total_generated_count:"+str(total_generated_count) + "\n")
 
         outs.close()
+    else:
+        print ("(Not saving '"+yaml_path+"' since same value of each current variable is already in file as loaded)")
 else:
     print ("failed since this folder must contain colors.txt and minetestmapper-numpy.py")