Adds a user profile.
public long profile_addUser( String accessToken, User user );
The profile_addUser operation adds a profile for a new Vibe user.
After you add a user profile, you can add a user workspace for the new user by using the profile_addUserWorkspace operation.
Either the security token passed to your application by Vibe as part of implementing a remote application, or the null value.
A User Java object containing the information needed to create a new user.
The identifier of the newly created user.