simple doesn't save fdt_paths unless asked to

ptx_simple.cc

@@ -56,7 +56,9 @@ void track(){
     keeptot += seedmanager.run(xst,yst,zst,false,0);
     string add="_"+num2str(Seeds(SN,1))+(string)"_"+num2str(Seeds(SN,2))+(string)"_"+num2str(Seeds(SN,3));
     
-    counter.save_pathdist(add);
+    if(opts.simpleout.value())
+      counter.save_pathdist(add);
+
     counter.count_seed();
 
     counter.reset_prob();