Allow existing users to register without errors

Instead of giving users who already have an account an error message when they register, this module sends a password reset e-mail to welcome them.

For example, a person who had their account created by an administrator, or who self-registered already but hasn't logged in yet, and tries to register at the site is now shown a message letting her know her account is approved and that they have been sent an e-mail with a reset-link for her password.

Without this module Drupal would trigger an unfriendly "This email is already in use" error.

This is especially useful when the admin create an account and the user never use the link sent by the admin, the user later will try to register and now will receive a message telling her that the account already exists and she just needs to set the password.