nixos/xfce: don't set a bloated GST_PLUGIN_PATH
nixos/environment: do not set GST_PLUGIN_SYSTEM_PATH
xfce4-mixer: use wrapper to set GST_PLUGIN_SYSTEM_PATH
updated wkhtmltopdf and use patched qt

With stock version of qt4 wkthmltopdf lacks a lot of features, including:
  * Running without an X11 server
  * Printing more then one HTML document into a PDF file
  * Adding a document outline to the PDF file
  * Adding headers and footers to the PDF file
  * Generating a table of contents
  * Adding links in the generated PDF file
  * Printing using the screen media-type
  * Disabling the smart shrink feature of webkit
Add a builder for Agda packages.
Use agda builder for stdlib. mv to all-packages
ocaml-javalib, ocaml-sawja: removes wrong path to bash in
configure scripts
mpi4py: New package, version 1.3.1
h5py: New package, version 2.3.1
gummiboot/builder: fix timeout setting when unset

The gummiboot-builder.py script is expecting the @timeout@ metavar to be
substituted for either an empty string (in the case where a user has
left the timeout unset) or the actual value set in the system
configuration.

However, the config.boot.loader.gummiboot.timeout option defaults to
'null', and due to the way pkgs.substituteAll works, the substitution
for '@timeout@' is _never_ set to the empty string.  This causes the
builder script to put a bogus line into /boot/loader/loader.conf:

   timeout @timeout@

Fix this by explicitly setting 'timeout' to the empty string when it's
unset in the system configuration.

Signed-off-by: Josh Cartwright <joshc@eso.teric.us>
nixos tested: only build on supportedSystems
release: do not process broken packages, we induce they don't have platforms at all
Update oraclejdk-7 patch version from 65 to 67
mpi4py: Adhere to package description convention
h5py: Adhere to package description convention
ocaml-javalib, ocaml-sawja: uses patchShebangs rather than ad-hoc patches
move ike to applications/networking folder
nspr: Update to 4.10.7
nss: Update to 3.16.4
firefox: Update to 32.0