Comment 3 for bug 2004587

We have a use case for going by owning library, not circ lib, so #1 isn't ideal.

My proposal based on your feedback:

- marc_export: add a new switch to provide options for the circ & owning lib handling, with the status quo being preserved if the new switch isn't added.

- Supercat: add library settings or global flags to match, but keep it light-weight. However, thinking about it more, the Supercat bit is optionally, perhaps, as the discovery layer in question (Aspen) is already looking at the additional holdings XML emitted by the marcxml-full option, so the contents of the 852 (for incremental updates) don't matter at present.