remove system mod

os/pl-rl.c

@@ -613,7 +613,7 @@ PL_install_readline(void)
   Serror->functions  = &GD->os.rl_functions;
 
 #define PRED(name, arity, func, attr) \
-	PL_register_foreign_in_module("system", name, arity, func, attr)
+  PL_register_foreign_in_module("prolog", name, arity, func, attr)
 
   PRED("rl_read_init_file", 1, pl_rl_read_init_file, 0);
   PRED("rl_add_history",    1, pl_rl_add_history,    PL_FA_NOTRACE);

pl/boot.yap

@@ -450,13 +450,13 @@ true :- true.
 			(print_message(error, E),
 	                 '$handle_toplevel_error'(Line, E))),
 	(
-	    '$pred_exists'(rl_add_history(_), user)
+	    '$pred_exists'(rl_add_history(_), prolog)
 	->
 	    format(atom(CompleteLine), '~W~W',
 		   [ Line, [partial(true)],
 		     '.', [partial(true)]
 		   ]),
-	    user:rl_add_history(CompleteLine)
+	    userprolog:rl_add_history(CompleteLine)
 	;
 	    true
 	),