Allow change_password_url to use $USER global

Requirements: Mail configured. 1) Create a test user, with manual auth_type 2) Temp hack the code for auth_manual to set a custom change password url which uses the $USER global, and trick Moodle into thinking it is an external auth type. Open the /auth/manual/auth.php file and change the following methods to make them look like this: function change_password_url() {     global $USER ;     return 'https://example.com/' . $USER ->id; } function  is_internal() { return  false; } function  can_reset_password() { return  false; } 3) Logout 4) Visit the password forgot page: /login/forgot_password.php 5) Enter the test username or email. 6) Check it sends an email with this url. Check the user id appears at the end of this URL (in the example below, 123) To change your password, please go to the following web address: https: //example.com/123