[book] replace PropagateSubjectRelation*Hook references PropagateSubjectRelationHook, PropagateSubjectRelationAddHook and PropagateSubjectRelationDelHook were deprecated by PropagateRelationHook, PropagateRelationAddHook, PropagateRelationDelHook respectively in v3.9, and removed in 3.18. Closes #3420672

#! /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
  fi
fi


#DEBHELPER#

exit 0