Change the slug system

It seems like a dilemma with the slug on users, because if you make a new profile with a name another one has had before they changed their name, they will get the same slug and overwrite each other. I found out of this after making an old character and putting him up to age.

Off course I have asked to get the slug on one of them changed, but my surgestion is changing the slug to a number, this way it will be easier for the background team too...