fix for cd when curent directory doesn't exist; fix wait -n in posix mode to delete any job that it returns; fix some variables where readonly can be circumvented; fix some overflows in printf

lib/readline/text.c

@@ -2093,6 +2093,9 @@ _rl_readstr_dispatch (_rl_readstr_cxt *cxt, int c)
   if (c < 0)
     c = CTRL ('C');  
 
+  /* could consider looking up the function bound to they key and dispatching
+     off that, but you want most characters inserted by default without having
+     to quote. */
   switch (c)
     {
     case CTRL('W'):
@@ -2168,6 +2171,12 @@ _rl_readstr_dispatch (_rl_readstr_cxt *cxt, int c)
 	}
       break;
 
+#if 0
+    case CTRL('_'):
+      rl_do_undo ();
+      break;
+#endif
+
     default:
 #if defined (HANDLE_MULTIBYTE)
       if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)