fetchurl: resume download of curl exits with status code 18
PGF: "upgrade" to version 3.00

It is not so properly an update, because the old versions will not be
obliterated from Nixpkgs. Hello backwards compatibility, my old friend...
Merge pull request #4373 from AndersonTorres/pgf

PGF: "upgrade" to version 3.00
Merge pull request #4350 from NixOS/curl_partial_download

fetchurl: resume download of curl exits with status code 18
org-mode: update from 8.2.7c to 8.2.8
node-packages: update titanium to latest stable version and update other NPM packages
Add linode python binding
python-linode: add myself as maintainer, fix meta
telepathy-qt: specify platforms
virt-manager: fix missing schema error

The dependency on gsettings_desktop_schemas wasn't specified correctly.
Now it works.

Fixes this error, as seen when trying to open a guest VM when
virt-manager is accessed over ssh with X forwarding:

  GLib-GIO-ERROR **: Settings schema 'org.gnome.system.proxy' is not installed
calibre: update from 2.4.0 to 2.5.0