[hierarchy-table] Link from HierarchyItem to HierarchyRow was a mistake
[hierarchy-table] Link from HierarchyItem to HierarchyRow was a mistake

The same HierarchyItem can be linked to several rows.
For instance:

Column A    Column B   ...
 A1          B1
 A1          B2
 A2          B1

B1 (HierarchyItem) has two associated rows.

dubzzz/js-tools,dubzzz/js-tools