Minor improvement to validation result JSP

The schema validation info is now a bit simpler in the case when there
was only 1 (i.e. the IMS QTI) schema involved.
Fixed ill-formed HTML in JSP

Corrected </body> to </tbody>
Removed redundant model calculation

A CandidateSessionSummaryReport was being calculated twice as a result
of refactoring. Now fixed.
Fixed bugs in computing model for assessment rept

There were some silly bugs in the logic building the MVC model for
the proctoring functions. These should be fixed here.
Fixed routing link to Delivery Settings Mgr
Replaced fixed grid with fluid grid

This should make QTIWorks embed more elegantly into smaller windows,
e.g. iframe LTI embedding in Learn.