core-pr-4

This module have been "re-forked" from DBC as it have been fundamental changed. So it's not the providers that logs into the library system at not the wayf module.

I will recommend that this module is forked from ding2tal to ding2.
Is it not possible to use [`user_external_login_register`](https://api.drupal.org/api/drupal/modules%21user%21user.module/function/user_external_login_register/7).