ExcelReader should be consistent across BulkEntities, UpdateLineage, ColumnMapping

[wjohnson]

Bulk entities supports applying...

• attributes
• root properties
  • Special rules for[root] classifications
  • Special rules for[root] labels
  • Special rules for contacts which is populated by experts and owners fields
• custom attributes
• relationship attributes
  • Including [Relationship] meanings to create term relationships

And future functionality gets added to Bulk entities first. This is inconsistent across the tabs.

At a minimum UpdateLineage and ColumnMapping should support these same features for the Process entity being updated.

This would involve refactoring out some of the rules in parse_bulk_entities.