UserManager.UpdateUserProfile(UserProfileData).
Adding UpdateUserProfile(UserProfileData) to IUserService interface.
Adding RemoteAdminPlugin.XmlRpcUpdateUserAccountMethod(...) to provide
a remote update capability.
TODO next is to make the login server read/write a users inventory from the correct server (the inventory url set in a userprofile)
On the region side, although not tested with multiple servers it should work if that inventory url was set, and the inventory servers urls have been added to the CommunicationsManager, using CommunicationsManager.AddInventoryService(string hostUrl)
* User tries to log-in but is already logged in. Userserver will send message to simulator user was in to log the user out there.
* From the UserServer, admin types 'logoff-user firstname lastname message'.
* Some regions may not get the message because they're not updated yet.
