[querier] test and fix potential bug in insertion query with multiple relations inside, caused by a name conflict. Also fix another bug non reproduced by using a set instead of a list (list may leads to compare entity instances which isn't allowed).

#! /bin/sh -e
 
case "$1" in
    purge)
        rm -rf /etc/cubicweb.d/
    	rm -rf /var/run/cubicweb/
	rm -rf /var/log/cubicweb/
	rm -rf /var/lib/cubicweb/
    ;;
esac
 
#DEBHELPER#
 
exit 0