User creation update

user_level is locked.

Removed buttons to change a user's user_level.

Added validations so only number 1,2,3 are accepted for the user_level.

Updated Registration/sign_up form to have a select box for user_level.

Customers never go to the User controller.
Customers only go to the Customer controller.
Old user page will eventually be weeded out after work has been backed
up.