Added Minetest-0.4.4.
virtinst: could not find python modules, add python wrapper
nvidia-x11: fix build with the latest Linux kernel
atlas: update to version 3.10.1

This patch fixes issue #297.
atlas: allow users to override the CPU configuration used to build ATLAS
haskell-heist: jailbreak to support the latest version of 'errors'
haskell-contravariant: update to version 0.4
haskell-either: update to version 3.4
haskell-errors: update to version 1.4.1
haskell-ghc-heap-view: update to version 0.4.2.0
haskell-hamlet: update to version 1.1.6.1
haskell-happstack-server: update to version 7.1.2
boost: add version 1.53.0

The default 'boost' attribute has not been updated yet as this needs
further testing.
Rename "boost-x.y.z-headers" derivation to "boost-headers-x.y.z" to ensure that
nix-env picks the full boost distribution when "nix-env -i boost" is installed.
lzip: add version 1.14-rc3
hplip: start work on making python programs work
hplip: now hp-setup actually shows a dialog
enable networking support for hplip, net_snmp is available now
fetchurl: Remove some compatibility hacks
fetchurl: Don't wait too long for the hashed mirrors

If the hashed mirror (nixos.org/tarballs) doesn't respond in 15
seconds, give up and try the original URL.