Add search for student in Student view
This MR:
- Adds a search box for the submissions/students in the Students view similar to that of the Grade view
- Fixes that the focus is lost anymore upon typing in the search box
- Makes the search box wider in the students view
- Makes the search box wider in the grade view
The third change was made because the suggestions were getting quite long now that they include the copy number. I think it doesn't hurt to also add it to the grade view.
Closes #327 (closed)
Edited by Hugo Kerstens