apt-offline: offline APT package manager
apt-offline: fixed typo
gnutls: fix CVE-2014-0092 except in 3.2.nix

Updated to 3.1.22 and patched 2.12.  3.2 still needs fixing (just
bumping to 3.2.12 led to a test failure).
gnutls: update 3.2.10 -> 3.2.12.1

The test failure mentioned in the previous commit was fixed in 3.2.12.1.
ImageMagick: update to 6.8.8-7

Fixes CVE-2014-{1947,1958,2030}.