Adds prove it buttons to the figure template
Render Delete checkbox as a separate form element
Adds function to delete File from a Reportback File entity
Fixes #3646 - delete files upon deleting reportbacks
Fixes #3644 - Adds alert when deleting RB image
Changes per #3653 review
Merge pull request #3653 from aaronschachter/delete_files

Delete Reportback Images
Refs #3566 - Check if file exists before rendering image
Merge pull request #3656 from aaronschachter/display_deleted

Reportback File teaser view mode
Updated variable name & usage
Fixes UK SSO registration.
Merge pull request #3657 from sergii-tkachenko/uk-fix-sso-error

Fixes UK SSO registration.
Updated variables
Merge pull request #3649 from deadlybutter/proveit

Adds prove it buttons to the figure template