Mail: bugfixes.

* mail/file.c: Use "headers" instead of non-standard "z."
* mail/mail.c: Avoid % interpretation in
the argument to util_cache_command.
* mail/util.c (_run_and_free): Avoid % interpretation in
the argument to util_do_command.

@@ -121,7 +121,7 @@ mail_file (int argc, char **argv)
       if (mailvar_get (NULL, "header", mailvar_type_boolean, 0) == 0)
 	{
 	  util_do_command ("summary");
-	  util_do_command ("z.");
+	  util_do_command ("headers");
 	}
       return 0;
     }

@@ -137,7 +137,7 @@ parse_opt (int key, char *arg, struct argp_state *state)
       break;
 
     case 'E':
-      util_cache_command (&command_list, arg);
+      util_cache_command (&command_list, "%s", arg);
       break;
       
     case 'F':
@@ -499,7 +499,7 @@ main (int argc, char **argv)
       if (mailvar_get (NULL, "header", mailvar_type_boolean, 0) == 0)
 	{
 	  util_do_command ("summary");
-	  util_do_command ("z.");
+	  util_do_command ("headers");
 	}
 
       mailvar_get (&prompt, "prompt", mailvar_type_string, 0);

@@ -1068,7 +1068,7 @@ util_cache_command (mu_list_t *list, const char *fmt, ...)
 static int
 _run_and_free (void *item, void *data)
 {
-  util_do_command ((char *) item);
+  util_do_command ("%s", (char *) item);
   free (item);
   return 0;
 }