Comment 32 for bug 907056

Another commit, nice and early tonight.

This one pares down the preferred library floating exuberance to only float preferred library copies to the top of the copy display if the search scope is consortial. This also enables us to get rid of the actor.org_unit_descendants_pref_lib() function.

user/dbs/unapi_improve_limits_and_tpac_display in working