libpng: minor update 1.6.10 -> .12
wayland, weston: update 1.4.0 -> 1.5.0
harfbuzz: minor update 0.9.28 -> .29
gdk_pixbuf: minor update 2.30.6 -> .8
xorg: maintenance updates of several modules
freetype: major update, including some CVE security

- There's no fontconfig update yet, as I failed to debug it yet.
- Infinality patches are now taken from a different (maintained) source.
xfce4-power-manager: update to 1.3.0, supporting upower-0.99
libxfce4util: minor update 4.10.0 -> 4.10.1
xfce4-appfinder: update 4.9.4 -> 4.10.1
buildNodePackage: add shell hook for development
kde: Copy 4.12 to 4.13 as a base
kde: Some tweaks to kde-manifest.sh

- Allow packages with different versions than $release (kde-workspace)
- Extra checks
alsa{Lib,Plugins}: update to 1.28.0

Dropped unrecognized option, patch no longer applying, fixed licenses.
upower: pull patches used in Ubuntu/trusty (fix #2884)
farstream: minor update
telepathy_qt: minor update, drop not applying patch

Also enableParallelBuilding.
telepathy-gabble: major update 0.17.2 -> 0.18.2

Also doCheck, enableParallelBuilding, and add meta attributes.
telepathy_mission_control: minor update, doCheck

Also add meta, and support upower.
llvmPackages: maintenance update to 3.4.2

Updated all that was released: llvm, clang, and libc++.
Merge master into x-updates

Conflicts (auto-solved):
	pkgs/os-specific/linux/alsa-plugins/default.nix