Add "Download annotations" admin action for campaigns #51
Description
Is your feature request related to a problem? Please describe.
To create a file with all annotations collected so far for a campaign one has to use the python manage.py ExportSystemScoresToCSV management command. There is no way to generate and download this data from the Django admin backend. The latter would be more convenient as it allows to get data without requiring access to both WebSSH and SFTP.
Describe the solution you'd like
Add a "Download annotations" admin action for Campaign objects.