Added Drag and Drop interface for feedback files
- When grading a student, feedback files can be added via drag and drop
- Caution was spent to avoid potentially slow refresh operations on
log exam protocols. All interactions use AJAX and update the
DOM tree directly
- The feedback files are displayed as thumbnails
- When permissions allow, the thumbnail files can be directly viewed and/or deleted
- Supports Bootstrap3 and Bootstrap 5
- Support for composite questions.
- bumped version number to 5.10.1d43