Bug#840324: atril: Atril does not open djvu files

[Andrey Gursky]

Dear Maintainer, dear Fabián,

a quick fix is (as root) to change the last string in (if you're on x86_64):
/usr/lib/x86_64-linux-gnu/atril/3/backends/djvudocument.atril-backend
from: MimeType=image/vnd.djvu
to:   MimeType=image/vnd.djvu;image/vnd.djvu+multipage

Upstream fix:
   https://github.com/mate-desktop/atril/commit/57456b842a9b990626b39edbd2e84af7b32b7b52
   djvu: support image/vnd.djvu+multipage MIME type
   More infos:
      https://git.gnome.org/browse/evince/commit/?id=7850b986cf3225369170cdec545844b025bfd12e

Regards,
Andrey