premake: bump to version 4.3

aacskeys depends on premake3, so keep that version around.
Upgrade bitlbee to 3.2
systemd: Update to 201

Fixes NixOS/nixos#135 and NixOS/nixos#126.
Remove the "proprietary" license

We already had "unfree".
socat: Update to 1.7.2.1

CVE-2012-0219
openssh: Update to 6.2p1
webob needs ssl module
haskell-accelerate: update to version 0.12.2.0
haskell-publicsuffixlist: update to version 0.1
haskell-wai-extra: update to version 1.3.4
emacs-prolog-mode: update to version 1.25
Adding silc-server.
silc-server: Nicer fetchurl src.
Adding silc-client as irssi plugin

Alone, with its own irssi, doesn't build.
silc_client: Missing file
silc_client: error in url

I should test better before push.
silc_client: more url problems

It was harder to test, after nix-prefetch-url. Damn it.
haskell-github: update to version 0.6.0
haskell-cabal-dev: update to version 0.9.2
git-annex: update to version 4.20130405