This change implements all the modes:
* Visitors cannot create users
* Visitors can create an account without confirmation nor admin approval
* Visitors can create an account with conformation and admin approval
* Visitors can create an account with confirmation and no admin approval
Move the admin menu under the Settings dropdown
Implement:
* Vistors can create accounts but administrator approval is required
* Email confirmations can be used or not used with above
* Welcome email is sent when the user is created
* Random password is generated when the user created and this is included in the welcome email.