New HoldingsRecord properties (non-breaking)

Simpler, non-breaking changes to the holdingsRecord: i.e. new optional fields and that do not change the structure of existing elements.

• HRID
• former holdings IDs (r)
• suppress from discovery
• electronic access {uri, linkText, materialsSpecification, publicNote, relationshipId} (r) (no relationshipId in spread sheet but assume we want it)
• holdings statements for indexes {stmt, note} (r)
• holdings statements for supplements {stmt, note} (r)
• number of items
• copy number
• call number prefix
• call number suffix
• shelving title
• acquisition format
• action notes (r)
• bindings (r)
• copy notes (r)
• provenances (r)
• public notes (r)
• reproduction notes (r)
• electronic bookplates (r)
• nonpublic notes (r)

https://docs.google.com/spreadsheets/d/1RCZyXUA5rK47wZqfFPbiRM0xnw8WnMCcmlttT7B3VlI/edit?ts=5b715226#gid=139536469

HoldingsRecord changes not included in this issue:

• Any breaking changes (see MODINVSTOR-209)
• Any new property that is (possibly) based on a new reference table (see MODINVSTOR-210)
  • ILL policy
  • Call number type
  • Acquisition method
  • Receipt status
  • Statistical search code
• Any new property for which there is still some uncertainty
  • Holdings type (ref table or free-text?) (see also: MODINVSTOR-210)
  • Shelving order (separate UIIN to be filed)
  • Donor information {dateUpdated, note, displayNote} - these are to be combined with data from order app - order line by order line; mechanism for that must be determined.
• Receiving history (MODINVSTOR-213)