Update log and admin to work with PHP v 7.2

Mostly changing mysql_ to mysqli_ but also some OOP fixes it classes,
especially the bbcode parser which doesn't have a new version working
with PHP 7.

scripts/update.php

@@ -1,6 +1,6 @@
 <?php
 $now_date = getdate();
-
+$errors = array();
 $data['rss'] = "";
 $data['rss_full'] = "";
 $data['sub'] = "";