Alliance forum fixes part 1

Fixed the majority of security issues:

+Fixed a bug that permitted to edit, delete and create a forum in any
alliance, without any permissions
+Fixed a bug that permitted to edit, create and delete any kind of
thread, with any kind of permission
+Fixed a bug that permitted to edit, modify and delete every kind of
post, without any kind of permission
+Fixed a bug that din't permit to create posts and threads
+Fixed a bug that permitted to create forum and threads with empty
name/topic
+Fixed a bug that permitted to move a thread to an invalid forum
+Fixed a bug that permitted to create an invalid type of forum
+Fixed a bug that didn't permit to move forums, to the top and the
bottom of their forum type (in reality, it wasn't even coded)
+Added a sorting column for supporting the "move to top/bottom"
functionality
+Minor improvements and bug fixing/code indentation/removal of redundant
code

NOTE: For playing this version, you HAVE to add a new column to the table "s1_forum_cat", you can simply do that by running this query (where "s1_" is the prefix of your server): ALTER TABLE s1_forum_cat ADD `sorting` int(11) NOT NULL AFTER `id`

var/db/struct.sql

@@ -745,6 +745,7 @@ CREATE TABLE IF NOT EXISTS `%PREFIX%fdata` (
 
 CREATE TABLE IF NOT EXISTS `%PREFIX%forum_cat` (
   `id` int(11) NOT NULL AUTO_INCREMENT,
+  `sorting` int(11) NOT NULL,
   `owner` varchar(255) DEFAULT NULL,
   `alliance` int(11) NOT NULL,
   `forum_name` varchar(255) DEFAULT NULL,