fix C major issues

- use delays to implement setup_call
- fix user_* flag
- error handling i CXX should b local
- fix mess on  how to call openQuert
- deter pt -> from a pointer to another one
- avoid text forms when you can use C: LOCLS to locals.h
- fux seto_call
- new gated call
- mem streams

C/flags.c

@@ -186,25 +186,19 @@ static Term stream(Term inp) {
 static bool set_error_stream(Term inp) {
   if (IsVarTerm(inp))
     return Yap_unify(inp, Yap_StreamUserName(LOCAL_c_error_stream));
-  LOCAL_c_error_stream = Yap_CheckStream(
-      inp, Output_Stream_f | Append_Stream_f | Socket_Stream_f, "yap_flag/3");
-  return true;
+  return Yap_SetErrorStream( inp );
 }
 
 static bool set_input_stream(Term inp) {
   if (IsVarTerm(inp))
     return Yap_unify(inp, Yap_StreamUserName(LOCAL_c_input_stream));
-  LOCAL_c_input_stream =
-      Yap_CheckStream(inp, Input_Stream_f | Socket_Stream_f, "yap_flag/3");
-  return true;
+  return Yap_SetInputStream( inp );
 }
 
 static bool set_output_stream(Term inp) {
   if (IsVarTerm(inp))
     return Yap_unify(inp, Yap_StreamUserName(LOCAL_c_output_stream));
-  LOCAL_c_output_stream = Yap_CheckStream(
-      inp, Output_Stream_f | Append_Stream_f | Socket_Stream_f, "yap_flag/3");
-  return true;
+  return Yap_SetOutputStream( inp );
 }
 
 static Term isground(Term inp) {