[user] Text [/user] and [guest] Text [/guest] tags [added [mod][/mod] , [self]

[Ivan Minic]

I think it is clear from the title, but maybe i should describe it a little bit..
Creating 2 tags, for mods and admins only that would make them possible to hide some parts of the post from guests and , hide some other from users.. or to show part of the content to user/guest only.