D2L Enhancement Suite

A few simple enhancements for the Desire2Learn system. * Adds a checkbox in the grade book that toggles highlighting of empty fields. Great for finding missing grades. * Adds an option to easily copy student names and grades from the Final Grades grade item. Useful for posting to the school's official grade system, such as Banner. * Hide correctly answered questions when grading quizzes. Helps with going over what a student missing on a quiz. Bug fixes/Enhancements: v1.5 - D2L changed an element ID which broke the highlighting feature in the grade book when viewing by user. I threw in a quick hack to fix it. I'm looking for a better long term solution to prevent this from happening again later. v1.4 - D2L removed the functionality to show/hide questions in quizzes, which broke my feature of hiding correctly answered questions. This has been fixed via a check box on the "Grade Attempt" page for quizzes. v1.3 - Added highlighting of zeros in the grade book. Fixed bug where "highlight empty fields" checkbox was appearing everywhere. v1.2 - Added highlighting of empty fields in the grade book. v1.1 - Added "final grades" export text box. v1.0 - Collapses correctly answered questions in quizzes.