MRBS 1.12.2 等保2.0二级整改完整提交

包含：登录失败锁定、90天密码有效期、30分钟会话超时、
强制改密、登录审计日志、屏幕水印、企业背景图、
备案信息固定底部、favicon、JS空集合保护、
会话过期体验优化（403 JSON）、display_errors 关闭、
固定 key 根治 Integrity check failed 等全部改动

注意：config.inc.php/.htaccess/.user.ini 含敏感信息，
通过 .gitignore 排除，勿推送到公开仓库。

upgrade/54/post.inc

@@ -0,0 +1,23 @@
+<?php
+namespace MRBS;
+
+// Check whether there the $year_range config settings are being 
+// used.   They have now been discontinued.
+
+global $year_range;
+
+if (isset($year_range))
+{
+  ?>
+
+  <script>
+  //<![CDATA[
+    alert('You appear to be using the $year_range config variable.  Please note that this ' +
+          'setting has now been discontinued and so you can remove it from your config file ' +
+          'as it is now redundant.');
+  //]];
+  </script>
+
+  <?php
+}
+