Revert "Revert "haskell-pandoc-citeproc: drop obsolete versions 0.4 and 0.5"".

This reverts commit dddea7f0d1ab765f. @jwiegley, Hakyll builds just fine with
pandoc-citeproc 0.6. See http://hydra.cryp.to/build/239248, for example. If you
have trouble compiling that package, then please share a build log that shows
the error message instead of reverting my commits, please.
Merge pull request #4948 from dysinger/purescript-0.6.0.2

purescript-0.6.0.2
flashrom: fix 4936
dnscrypt-proxy: new expression
Add dnscrypt-proxy service

The dnscrypt-proxy service relays regular DNS queries to
a DNSCrypt enabled upstream resolver.
The traffic between the client and the upstream resolver is
encrypted and authenticated, which may mitigate the risk of
MITM attacks and third-party snooping (assuming a trustworthy
upstream).

Though dnscrypt-proxy can run as a standalone DNS client,
the recommended setup is to use it as a forwarder for a
caching DNS client.
To use dnscrypt-proxy as a forwarder for dnsmasq, do

```nix
{
  # ...

  networking.nameservers = [ "127.0.0.1" ];
  networking.dhcpcd.extraConfig = "nohook resolv.conf";

  services.dnscrypt-proxy.enable = true;
  services.dnscrypt-proxy.localAddress = "127.0.0.1";
  services.dnscrypt-proxy.port = 40;

  services.dnsmasq.enable = true;
  services.dnsmasq.extraConfig = ''
    no-resolv
    server=127.0.0.1#40
    listen-address=127.0.0.1
  '';

  # ...
}
```
prl-tools: add package
nixos/parallels-guest: add options
Merge remote-tracking branch 'origin/master' into staging

Conflicts:
	pkgs/development/libraries/boost/generic.nix
Fix /dev/root udev rule in the ISO
ipopt: add package
Merge pull request #4953 from abbradar/ipopt

ipopt: add package
tibia: update to 10.62
apache-httpd: add mod_access_compat for compatibility with old httpd-22 configurations
Catalyst::Runtime: Require Term::Size::Any

Otherwise you get stupid warnings all the time.
add labeled-tree
Merge pull request #4960 from jyp/hask-pkgs

add labeled-tree
Merge pull request #4959 from robberer/modules/httpd24

apache-httpd: add mod_access_compat
haskell-PastePipe: update to 1.7
Fix envHooks setting: don't kill previous hooks
Support more quicklisp upstream source types