Table Merger on Lists with Subitems

The Table Merger Macro should ignore subitems when merging tables. Subitems should be rendered as defined. Only toplevel element should be merged.

Subitems that are empty, have no links, or have no items should be removed, if discard-empty, discard-no-links, or discard-no-items is selected.

Currently the subitems are added as duplicates at the bottom of the list.