Disable fuppes module

fuppes has not been compiling for a long moment, and the ffmpeg version on
which it depends is no longer listed in nixpkgs.
dylan: Remove old gwydion-dylan package.

The Gywdion Dylan compiler that was packaged here is old and this
package no longer builds. The Gwydion Dylan compiler is no longer
maintained, and has been replaced by the Open Dylan compiler which
is already packaged in Nix (opendylan).
VirtualBox: Fix ALSA audio.

Use a sed replacement to ensure that dynamic loading of libasound works.
Merge pull request #4079 from ambrop72/virtualbox-alsa

VirtualBox: Fix ALSA audio.
Merge pull request #4047 from waywardmonkeys/remove-gwdyion-dylan

dylan: Remove old gwydion-dylan package.
Merge pull request #4041 from nbp/disable-fuppes

Disable fuppes module
add python2nix
libibumad: Add derivation
libibmad: Add derivation
mstflint: Add derivation
boost-build: Add derivation
boost: 1.55 -> 1.56
boostHeaders: regular boost package now only contains headers
libyamlcpp03: Remove old version
libyamlcpp: Correct meta information and boost
mongodb: Fix build