Order models reasonably

Set the ordering meta attribute for all models (in all apps) to reasonable values.

changed milestone to %1.0a1

added part::backend prio::3 source::customer type::bug labels

assigned to @dummerdelfin and unassigned @nik

changed the description

changed milestone to %1.0a0

assigned to @nik and unassigned @dummerdelfin

closed via commit b90b4515