Removed left-over debugging message
Improved del settings mgmt for instructors

* Added "delete settings" option in MVC layer
* Tidied up controllers a bit
* Will port to LTI next...
Removed unused modernizr.js pull-in
Ported DelSettings MVC to LTI dispatcher
Added AssessmentStatusReport DTO for MVC layer
Cand sessions are now terminated on ass pkg update

This resolves a corner case I was undecided about. The instructor
will get a warning about this.
Added confirmation to "replace ass pkg" in MVC

Confirmation is now sought if there are any non-terminated
candidate sessions (with userRole==CANDIDATE)
Selection of LTI resource ass/ds now sketched out
Updated DataDeletionService

This now handles both Ass->Del and Del->Ass
associations.
Added validation option to importAssessment()
Removed unused model attrs from standalone runner
Moved LTI result set up to Assessment entity

(Also added @Version fields to Delivery and DeliverySettings entities.)
Fixes to templateProcessingLimit entity property

Handling of NULLs was not consistent. Fixed here.
First cut of CRUD for LTI outcomes settings
Renamed UpdateAssCommand -> AssMetadataTemplate
Started MVC for selecting LTI outcome vars