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ced338fd20
Add back code to parse transaction commit and abort records, and in particular the list of dropped relations in them. Add 'put_unlink' function to the Timeline trait and implementation. We had the code to handle dropped relations in the GC code and elsewhere in ObjectRepository already, but there was nothing to create the RelationSizeEntry::Unlink tombstone entries until now. Also add a test to check that GC correctly removes all page versions of a dropped relation. Implements https://github.com/zenithdb/zenith/issues/232, except for the "orphaned" rels. Reviewed-by: Konstantin Knizhnik