Bug#839547: gnupg: unable to decrypt file

[Paul Rogé]

For the moment, I've resolved the issue by downgrading to the stable 
version of gnupg. I activated the stable release and modified 
/etc/preferences as such:

      Package: gnupg*
      Pin: release a=stable
      Pin-Priority: 991
I also had to replace my directory of gnupg keys with a backed up 
version from before the upgrade to make it work.

- Paul