[session] have a nice helper function to forward access to session
This allows a lighter and clearer code. This will also ease the addition of
deprecation warning in the future.
#! /bin/sh -e#if [ "$1" = remove -o "$1" = upgrade ]; then if which install-docs >/dev/null 2>&1; then install-docs -r cubicweb-doc fifi#DEBHELPER#exit 0