Add field types that require reconciliation of mutiple fields at the same time

[rafelafrance]

• [x] row.py
• [x] table.py
• [x] highlighter_field.py
• [x] length_field.py
• [ ] polygon_field.py
• [x] common_format.py
• [x] to_reconciled_dict
• [ ] label finder field (for Digi-Leap)
• [ ] explanation spans in summary
• [x] fix field summary in summary report
  • [ ] only 1 row per reconciled field
• [x] tests
  • [x] column order for extra unreconciled fields
  • [x] highlighter relabel suffixes