Configuration override options was misleading. In reality those are
options you most probably don't want to mess too much with so let's call
them rather advanced options.

This also moves PUBLISH_BRANCH in example configuration file to
section: don't mess with. This is because now we provide it from
defaults and user just should not mess with it unless he know what he is
doing.

OpenWRT commit to be used is specified in feeds.conf file with rest of
feeds now so it makes not sense to overwrite it. This is just confusing
without any real gain in here. You can always modify feeds.conf file to
achieve the same.

Driver for DSA switch chip was enabled but DSA it self was not. This
commit enables it as well.

This makes sure if there isn't this package, the build fails
Also, reorder section Turris packages

We have to ensure that languages are installed when module is installed.
It does not matter if that is done immediately or later but it has to be
done. The solution in here is to check if module is installed and if so
also request languages for it.

This adds code that is not pkglists dependent and when any Foris plugin
is installed it should automatically also maintain languages.

Note that lists are not aware of Foris packages existence so they need
list of all existing plugins.

Signed-off-by: Marek Behún <marek.behun@nic.cz>

This should fix the Omnia bug when system restarts if no PCIe cards are
connected.

Signed-off-by: Marek Behún <marek.behun@nic.cz>