Changed LU_BuildInstance to create separate OLEHoldings records for each
URL associated with a bib record.  Call number is also now set correctly
using the $a subfield of a 999 field.

I began work on loading serials receiving records into OLE, using an
olemigration temporary database and PHP scripts that Michelle Suranofsky
wrote to load exported issues and serials receiving control records from
Sirsi into the olemigration database.