cubicweb-vcsfile #1749092 c-c vcscheck should reset parent_revision and at_revision [resolved]

so we ensure we don't pull erroneous stuff

prioritynormal
typebug
done in1.8.3
load0.500
load left0.000
closed by#b14abfa1cd7d enhance vcscheck: cleanup parent_relation / at_revision relations. Closes #1749092