Martin Dougiamas

The email is always sent, but may never get there. Moodle can't detect that, so what you're asking is unfortunately not possible.

Basically, the student just has to try again and pick a new username.

After 7 days the old, unconfirmed accounts will be automatically deleted by the cron process, and the original username will be freed up again.

I don't usually use RPMs myself, but I think you can 'Freshen' a whole bunch at once using:

rpm -Fvh [filenames]

It looks to me like your PHP has lost its MySQL support.

See http://moodle.org/mod/forum/discuss.php?d=259

Has PHP been upgraded lately? Have any of the MySQL settings been changed?

Sounds like you haven't got cron running:

http://moodle.org/doc/?frame=install.html&sub=cron

Legally, you can change the code however you want.

On a personal level, I obviously prefer the default situation (logo and link) which is why it's the default. But I'm fine with you removing either or both - so it's up to you.

In the hypothetically extreme situation where someone was to remove the logo AND the link, and then redistribute or sell the system under a complete different brand, then I would definitely would not be inclined to offer that person any assistance on this site.