Files uploaded with internal notes are only accessible by uploadee

[torgeirl]

If an admin or examiner uploads files with an internal note (only visible to examiners and admins) in the feedback feed the file is inaccessible to everyone except the uploadee, yielding a HTTP 404:

Http404: null
  File "django/core/handlers/base.py", line 197, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "cradmin_legacy/crapp.py", line 86, in viewwrapper
    return has_access_to_cradmin_instance(cradminview(view))(request, *args, **kwargs)
  File "cradmin_legacy/decorators.py", line 32, in wrapper
    return view_function(request, *args, **kwargs)
  File "cradmin_legacy/decorators.py", line 70, in wrapper
    response = view_function(request, *args, **kwargs)
  File "django/views/generic/base.py", line 104, in view
    return self.dispatch(request, *args, **kwargs)
  File "django/views/generic/base.py", line 143, in dispatch
    return handler(request, *args, **kwargs)
  File "devilry/devilry_group/views/download_files/batch_download_files.py", line 43, in get
    raise Http404()

The file should have limited access, but that should include other examiners and admins with access to that particular feedback feed (those who can read the comment to which the files are uploaded with).

[torgeirl]

Fixed in 3c9f0f8.