The location information model is updated automatically by the
divelist-model and the undo commands. Therefore remove the
QMLManager::updateSiteList() function. We do have to keep
the locationListChanged() signal though, because the list
of dive sites is not exported via model/view but rather via
a Q_PROPERTY. We really should change that.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>