virtualbox: Fix permissions for /dev/vboxdrvu

See https://bugs.archlinux.org/task/38314 and https://www.virtualbox.org/browser/vbox/trunk/src/VBox/Installer/linux/installer-common.sh?rev=47894#L28
Adds biniou
dhcpcd: Update to 6.4.0

The lxc_ro_promote_secondaries patch no longer applies so I disabled
it for now (@offlinehacker).
openresolv: Update to 3.5.7
Manual: html -> xhtml
Merge pull request #3079 from wmertens/patch-4

virtualbox: Fix permissions for /dev/vboxdrvu
Clarifies the license; populates meta.platforms
Make php packages available in nix-env
haskell-AES: fix spelling of the corresponding attribute and directory name
haskell-SHA2: refer to AES library with its proper attribute
xmobar: set the proper home page url
Simplify php-packages.nix
Remove obsolete php-apc package
Use buildPecl for php-xcache
nodePackages.couchapp: added & and node packages updated
haskell-cpphs: update to version 1.18.5
haskell-arbtt: update to version 0.8.1
haskell-sloane: update to version 1.8.2
haskell-Chart-cairo: update to version 1.2.3
haskell-Chart-diagrams: update to version 1.2.3