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、登录页JS修复等全部改动

web/upgrade/50/post.inc

@@ -0,0 +1,11 @@
+<?php
+namespace MRBS;
+
+// Populate the new periods column in the area table with the default values taken
+// from the config file.
+
+global $periods;
+
+$sql = "UPDATE " . _tbl('area') . " SET periods = ?";
+
+$upgrade_handle->command($sql, array(json_encode($periods)));