Also, there is no annoying reload upon logout anymore

also removed one passible cause for memory leak. Feedback was unnecesarily stored in the store under state.feedback

Solution is no longer displayed on student page because it may contain grading information which has been changed during the grading process and would thus confuse the student

Use postgres:9.6 is ci

The student page will no longer crash should there be no feedback objects for submissions and display a message to the user explaining that the submission hasn't been corrected due to the exam beeing pass only.

Closes #101

Added HIDE/SHOW FEEDBACK Button in submission Correction top toolbar to toggle the visibilty of all comments (own as well as others). Open editors are not closed.

closes #91

Forgot one slash...