LD should be local to threads.

get rid of write_depth on YAP side.

C/write.c

@@ -1094,8 +1094,8 @@ Yap_plwrite(Term t, int (*mywrite) (int, wchar_t), int flags, int priority)
   wglb.Quote_illegal = flags & Quote_illegal_f;
   wglb.Handle_vars = flags & Handle_vars_f;
   wglb.Use_portray = flags & Use_portray_f;
-  wglb.MaxDepth = max_depth;
-  wglb.MaxArgs = max_write_args;
+  wglb.MaxDepth = 0L;
+  wglb.MaxArgs = 0L;
   /* notice: we must have ASP well set when using portray, otherwise
      we cannot make recursive Prolog calls */
   wglb.keep_terms = (flags & (Use_portray_f|To_heap_f));