more fixes to search permissions: - require that for links and multilinks the searching user has access to at least the orderprop, labelprop, and ID of the linked class - allow combinations of roles: we previosly required that for transitive properties all elements where searchable by the same role. We now allow that the roles can be different for each property. This allows assigning different roles to different sub-systems and allowing users having all required roles to search across subsystems. - regression test updated - fix doc/upgrading example for new signature of roleHasSearchPermission