BREAKING CHANGE: the integrations alakazam shipped as combine.yml are gone
from the repository. Copy examples/config-sets-combine.yml into the root path
to keep them, where they can be pinned and adjusted along with the versions.
An integration is now a config-set carrying 'apply-when', which names the apps
whose presence makes it apply. Naming the condition rather than deriving it
from the configured apps is what lets a set configure only one side, as four
of the seventeen pairs in combine.yml did.
moritz