Rename util_show_error_page() to util_show_error_page_and_exit() and redirect() to util_redirect_and_exit()

so it is explicit that we exit in those functions that so we know it isn't necessary to put an exit after
we call them

admin/editBundle.php

@@ -4,7 +4,7 @@ include("path.php");
 include(BASE."include/"."incl.php");
 
 if(!$_SESSION['current']->hasPriv("admin"))
-    util_show_error_page();
+    util_show_error_page_and_exit();
 
 function build_app_list()
 {