[storage/bfss] ensure bfss never remove a cw_edited item (closes #2236287) When the <old value> == <new value> (not really and update but can happen), the value was popped but never restored. The cw_edited attribut had wrong content for a small time lapse.

#!/bin/sh -e
if [ "$1" = "purge" ] ; then
        update-rc.d cubicweb remove >/dev/null
fi
 
#DEBHELPER#
 
exit 0