Extended system of rights

Hello,
I liked your project, but I was not happy with some system for allocating rights to category / forums. I had the courage to change your project under my needs.
What I did:
- remove "hidden" attribute
- added restrictions for anonymous users
- various rights to groups

![50c87f11e4b006dd760e4886](https://f.cloud.github.com/assets/2110415/8021/a6638c72-445b-11e2-94e5-2d80384dc763.png)

![ 2012-12-12 16 57 39](https://f.cloud.github.com/assets/2110415/8022/bf3817c2-445b-11e2-9bcd-e88039e64e05.png)