ACQ+Vandelay API to support Vandelay-mediated imports

ACQ+Vandelay API to support Vandelay-mediated imports

Adds support for merging, overlaying, importing, and linking (a no-op
merge) acquisitions lineitems to catalog records via Vandelay.

All non-imported lineitems will now be processed through Vandelay during
record upload and asset creation (load bibs and items), based on the
Vandelay import parameters provided by the caller.  Each processed
lineitem will also be linked to its queued Vandelay record.  In the case
of a failed import, such records can be subsequently imported manually
from the Vandelay interface using the manual record overlay options.

ACQ API calls affected now report on the progress of Vandelay record
import in addition to lineitem creation, copy creation, etc.

Signed-off-by: Bill Erickson <berick@esilibrary.com>