scossu/lakesuperior_legacy: Legacy Lakesuperior code. @ 2f547a2536e5ba4dc11c0ce9be9ab3255dc9a790

Stefano Cossu 2f547a2536 Fix deleting resource with missing prefer header; add tombstone tests.		7 lat temu
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TODO	7931c4c2a8 Initial PoC messaging with key parts in place.	7 lat temu
fcrepo4_deltas.md	2f547a2536 Fix deleting resource with missing prefer header; add tombstone tests.	7 lat temu