Added "username" and "fullname" fields to registration form.
Ability to use username or email for login.
User will receive activation email if he trying to login and his account was not activated
Fixed #1 - Improved regular expression for supporting of all unicode characters
Fixed #2 - clearing of user photo
Improved disabling of form elements
Fixed #3 - Ability to use $_GET['hauth_return'] for redirecting user to any page after authorization.