Course statistics, evaluation overview changes

Course statistics: Students and attempts -toggle is replaced by separate tabs, except the toggle remains in "Pass rate chart" tab.
** Evaluation overview > University view**: Allowed more users to see it. Also, added links to individual faculty overviews. Showing loading icon always if request has not yet arrived.

Internal

• Rapodiff credits diff work in progress: Added csv parse.
• Added studyguidance tests
• Returned date into production console logs
• Refactored evaluation overview into its own files for separate control of rights