Implements senior coder role
Fix alignment of admin menu in header
Add views for reviewed codings
Add deployment SQL for addition of senior coders
Working, prior to updating entry to allow reviews
Add endpoint to associate Studies with reviews
Add rough form entry features; allow SCs to associate studies
Add flags for group membership to template variables.
Allow SCs to view all completed codings
Allow SCs to claim papers for review.
Add entry form features for senior coders

Add comparison fields to fields for both studies and tests; ugly but
functional.
Incremental commit
Allow review codings to be deleted by the author or admin.
Fix bug in SC entry form display
Incremental commit
Add email upon claiming by a senior coder.
Hide senior coding divs for junior coders.
Fix bug where entry form would disable for unclaimed papers.
Add confirmation modal when marking a coding complete.
Change "certainty" fields in entry form to radio buttons.