radvd: Upsate 1.8.1 -> 2.5
nixos/radvd: Convert to a systemd unit

Additionally, remove the automatic initialization of the ipv6 forwarding
sysctl as this should be handled by the end user. This really should not
be an issue as most people running radvd are likely forwarding ipv6
packets.
Updated definition file as per comments from the collaborator
cantata: update to 1.4.0
Merge branch 'master' into add-sphinx-search
New Haskell package: network-fancy
Merge pull request #3754 from Twey/network-fancy

New Haskell package: network-fancy
nixos: add fail2ban to module-list.nix

Now that the fail2ban service has the ".enable" option, I think it's
time to add it to the module list, so that we can enable it in
configuration.nix like this:

  services.fail2ban.enable = true;
ffado: update from 2.1.0 to 2.2.1
keymon: update from 1.16 to 1.17
xf86_input_wacom: update from 0.25.0 to 0.25.99.1
movit: update from 1.1.1 to 1.1.2
yelp: Fix description
tarball fixes
buildPythonPackage: introduce "disabled" argument

Useful to disable the package for specific python versions.

Typically usage: disable = isPy3k;
pythonPackages.pg8000: 1.09 -> 1.9.14
nixbang: add expession
pythonPackages.iptools: 0.4.0 -> 0.6.1
Remove obsolete directory
meta.xml: fixed small omission