ACQ+Vandelay schema and IDL changes w/ upgrade script

ACQ+Vandelay schema and IDL changes w/ upgrade script

Adds a queued_record link from acq lineitems to vandelay queued record.
Ditto acq_lineitem_history.  This will be used to link vandelay-mediated
acq lineitems to the vandelay record used for their import.

For ease of future changes, port the queue_type column from bib and
authority queues to ENUMs and drop the constraint, which is implicit in
the ENUM.

Signed-off-by: Bill Erickson <berick@esilibrary.com>
Signed-off-by: Ben Shum <bshum@biblio.org>