WIP mock up new nested record model with: TopContainer > SubContainer <--- Instance
Add some validation rules to the sub record
Get some frontend things working
Force load the JSONModel scehama rather than lazy initialize so they are available for parse_reference.  Also enable edit of top_containers
Use a merge instead of concat when updating find_opts
Fix our custom can_edit_search_result? so it works for archivist users with the permision manage_containers - I was erroneously calling user_can? with an extra param
Merge pull request #2 from hudmol/refactor-to-nested-record

Refactor to nested record