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Fix MET-502: make field 884 mergeable, set merge constraints for it. Also fix a bug in field counterpart decisions. (Controlfields $5 and $9 were used in name&title part comparisons, if no subfield code was required. Removed these controlfields from comparisons).
Improve MELINDA-8978: if source has an Asteri $0, and the counterpart base field has not, use the source field as the field, to which the other fields' subfields are merged.