update _render_attribute / _render_relation prototype to gain more control on label through uicfg (for attributes and relations). Keep bw compat for crm/iliane
#! /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