[rt-users] missing root db user in 3.6.1

[Dario Luis Coneglian Oliveros]

What happened to root db user ? It does not seem to exist in 3.6.1 anymore.
After installing the lastest release, I noticed RT_System was the only 
user in database (I am using MySQL).
In the past I would setup a new database and root was automatically created.
I wonder if there's another way to have an admin user after a fresh 
install. Any hints ?
Thanks,
Dário