Activity Rebuild

[lomky]

Development of the new Activity Model formulated with TSU.

Initial Field Hashing Out
Discussions
Final Model

Process:

• Modified Fields
  • [x] Update start_time comment to explain 'temporal point'
  • [x] Update end_time comment to explain 'temporal point'
  • [x] Update non-deprecated fields with clearer comments
    • [x] visualization_software
    • [x] output_artifacts
    • [x] methodology
• Deprecated Fields
  • [x] Deprecate duration in favor of activity_duration
  • [x] Deprecate data_usage
  • [x] Deprecate notes
  • [x] Deprecated output_artifacts for use outside of TSU specific reports
• New Fields
  • [x] Create activity_duration field
  • [x] Create source_access_date field
  • [x] Create interim_artifacts field
    • [x] Deprecated for use outside of TSU specific reports
  • [x] Create source_modifications field
  • [x] Create modified_source_location field
  • [x] Create visualization_methodology field
  • [x] Create methodology_citation field
  • [x] Create methodology_contact field
  • [x] Create database_variables field
  • [x] Create spatial_extent field
    • [x] Enforce geoJSON validity?

Completes #613

[lomky]

Thanks all!