The goal is to send the signal for the correct dives / divesites
and thus not having to reload the whole model.
Right now the mobile UI does not yet catch the diveSiteChanged signals.
[Dirk Hohndel: small fix to ensure that we trigger a save to storage]
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>