varnish: adding version 2.1.x
ejabberd: updated to 2.1.13
pythonPackage: afew and alot update to latest

added subprocess32 package as new dependency of afew
venus.nix: Fix broken startAt option
mathematica: fix x86 build of mathematica

the MathInstaller doesn't distinguish between 64bit and 32bit linux
platforms.
quodlibet: update to version 2.6.3

also provides two distinctive flavours, which either wrap the program to
pull in the gstreamer plugins or not.
afew: forgot to add --replace
Linux 3.12 release

Signed-off-by: Shea Levy <shea@shealevy.com>
fcron: Fix error when cron.mailto is null.

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
redshift: add platforms