User name changes now allowed

[Lynne]

We changed it now because we decided to re-evaluate our policy on it.

As the notice says, once every three months *but* the admins have final say. If someone comes back to change it every three months, we may finally just say they've done it enough and it's time to just settle on a name and leave it. I really can think of no reason why someone would need to change it every three months.