Add additional fields to the SS record for each item

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Better data import and field sanitisation
Update Trove data source decorator to set contributor nodes and relationships
Move existing relationships utility function
Add WorldCat identities data source
Include name in contributor nodes
Associate contributors with FAST subject headings
Don't request an identity if we don't know the LCCN
Friend identification
More conservative friend identification
Update composer dependencies
FIX php-cli doesn't seem to handle this.
Update friends job