fix answer_trie compilation and execution:

- YapOpcodes.h should have do/trust/try/trust: force this order in
tab.tries.insts.i
- retry and trust instructions should not trust YENV

C/tracer.c

@@ -164,10 +164,6 @@ low_level_trace(yap_low_level_port port, PredEntry *pred, CELL *args)
   LOCK(Yap_heap_regs->low_level_trace_lock);
   sc = Yap_heap_regs;
   vsc_count++;
-  if (vsc_count < 88000)
-    return;
-  if (vsc_count == 88483LL)
-    jmp_deb(1);
 #ifdef THREADS
   Yap_heap_regs->thread_handle[worker_id].thread_inst_count++;
 #endif