The derivation primop doesn't play well with null outputs attribute
udisks1: bump to fix CVE-2014-0004

Also systemd unit is now installed.
Thanks to nixpkgs monitor again, as for all my CVE commits.
put systemd unit dirs on the right place

Also see #1936.
libpng: update 1.6.9 -> .10 to fix CVE-2014-0333
libpng12, libpng15: minor updates of legacy versions
goffice: minor update, dep cleanup

Also enable parallel building.
gnumeric: minor update 1.12.9 -> .12
pcsclite: update download url

The current one doesn't work.
Merge remote-tracking branch 'upstream/master'