Removed a few typos in XMLElement labels.  Took codeValue out of
ItemType since bulk ingest threw an exception on it for some reason,
then added it in separately for TemporaryItemType.  Added a check that
the $u subfield of an 856 is not null before trying to read it.  Changed
how serializing and marshalling of XML is configured in
LU_BuildOLELoadDocs to get the XML declaration omitted, preserve
indenting, etc.