Allows deleting (your own) forum replies.
Fixes#90
## How to test
1. Log in as `eric@example.com` (supervisor) or as `sture@example.com` (author)
2. Open the forum in project "Putting the it in supervising"
3. Create a new thread
4. Post some replies as the different users
5. Delete the replies
Co-authored-by: Nico Athanassiadis <nico@dsv.su.se>
Reviewed-on: #137
Reviewed-by: Nico Athanassiadis <nico@dsv.su.se>
Co-authored-by: Andreas Svanberg <andreass@dsv.su.se>
Co-committed-by: Andreas Svanberg <andreass@dsv.su.se>
Andreas Svanberg
7504c267c5