Bug 13068: Follow-up for cleaning up atomicupdate folder

Bug 13068: Follow-up for cleaning up atomicupdate folder

The folder atomicupdate can be cleaned up. It mainly contains old files that
are not used any more.
I found two files that are still referenced:
[1] Bug-4246-Talking-Tech-itiva-phone-notifications.pl
    A readme file refers to it. The code in this file slightly differs
    from the TalkingTech db revision. It can probably be deleted too, but
    I will first check.
[2] oai_sets.sql
    This file should remain. It is used in dbrev 3.07.00.029.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>