[migration] when adding a cube, skip infered relations (closes #3005576)
Skipped infered relations are recalculated later.
#! /bin/sh -e#if [ "$1" = configure ]; then if which install-docs >/dev/null 2>&1; then install-docs -i /usr/share/doc-base/cubicweb-doc fifi#DEBHELPER#exit 0