Allowing passwordless login via GDM

[David Prieto]

> This should not be necessary at all. gdm's configuration program
> already offers the option of automatic login

But that would only be useful in his case:

-if he actually wants his parents to automatically log in every time the
computer is booted, which might not be the case.

-if his parents have a single user account.

In any other scenario, what he demanded COULD be necessary -or at least
it would be convenient-.