Add expression to build the eboard chess client
Correct patch the rpath for GHC-built executables on Darwin

@peti This addresses #2488.
Build ppl and gmp correctly for building gcc48 on darwin
Change stdenv on darwin to not set NIX_ENFORCE_PURITY
unbound: update from 1.4.21 to 1.4.22, service from Upstart to systemd
sane: Make SANE_CONFIG_DIR overrideable
spotify: Update from 0.9.4.183.g644e24e.428 to 0.9.10.17.g4129e1c.78 (only for x86_64)
libvpx on darwin: attempt to fix build

CC @lovek323.
arcanist: 20140521 -> 20140530

Signed-off-by: Austin Seipp <aseipp@pobox.com>
samba: install pkg-config files

Close #2794, fixes #1341.
disk-indicator: Add package

A program that will turn a LED into a hard disk indicator.
perlPackages.DevelTrace: New module

Print out each line before it is executed (like sh -x).
nixos.tests.installer: Attempt to fix race condition

Attempt to fix race condition in installer tests, especially the
grub1 test.

The latter was failing when running "parted /dev/sda ..." because
/dev/sda didn't exist yet.
Plone: update to 4.3.3
arcanist: Fix php exec (needed for arc diff)

Signed-off-by: Austin Seipp <aseipp@pobox.com>
git: Update to 1.9.4
icu: fix configure to use ${stdenv.shell}

On darwin, not doing this means the configure script uses a hard-coded
/bin/sh for its echo tests, resulting in ECHO_N and ECHO_C settings in
icu-config which are incorrect for the stdenv.shell which it is actually
uses to run.
harfbuzz: no longer need to guard withGraphite2 on darwin
libftdi1: new package

This is the 1.x version of libftdi, as opposed to our existing libftdi
0.20 package.

(AVRDUDE is an (optional) dependee of libftdi1.)
avrdude: rewrite expression

* Use stdenv.mkDerivation instead of composableDerivation.
  stdenv.mkDerivation is the current coding standard and is easier to
  read (IMHO).

* Remove the 'parportSupport' flag because it doesn't do anything.
  (Parallel port support is still enabled.)

* Remove unneeded --disable-dependency-tracking flag to ./configure; our
  default builder does that already.

* Fix documentation build. But it is still disabled (by default),
  because texLive is such a big dependency. There is always the man
  page.

* Update 'meta' attributes