gnu: gst-plugins-base: Update to 1.8.2.

* gnu/pakcages/gstreamer.scm (gst-plugins-base): Update to 1.8.2.

gnu: gstreamer: Update to 1.8.2.

* gnu/packages/gstreamer.scm (gstreamer): Update to 1.8.2.

tests: install: Generalize 'run-install'.

* gnu/tests/install.scm (%simple-installation-script): New variable.
Contains installation script formerly in 'run-install'.
(run-install): Add 'target-os', 'target-os-source', and #:script
parameters.  Honor them.
(qemu-command/writable-image): New procedure.
(%test-installed-os): Use it.

system: Honor the 'dependencies' field of file systems.

This allows mapped devices listed in 'dependencies' to be properly taken
into account.

Reported by Andreas Enge <andreas@enge.fr>.

* gnu/system.scm (mapped-device-user): Check whether DEVICE is a member
of the 'dependencies' of FS.
* tests/system.scm (%luks-device, %os-with-mapped-device): New variables.
("operating-system-user-mapped-devices")
("operating-system-boot-mapped-devices")
("operating-system-boot-mapped-devices, implicit dependency"): New tests.

gnu: Add xdelta.

* gnu/packages/compression.scm (xdelta): New variable.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu: diamond: Update to 0.8.15.

* gnu/packages/bioinformatics.scm (diamond): Update to 0.8.15.

gnu: hoedown: Update to 3.0.7.

* gnu/packages/markdown.scm (hoedown): Update to 3.0.7.

gnu: stalonetray: Update to 0.8.3.

* gnu/packages/stalonetray.scm (stalonetray): Update to 0.8.3.

gnu: python-simplejson: Update to 3.8.2.

* gnu/packages/python.scm (python-simplejson): Update to 3.8.2.
[source]: Use 'pypi-uri' format.

gnu: behave: Update to 1.2.5.

* gnu/packages/python.scm (behave): Update to 1.2.5.
[source]: Use 'pypi-uri' format.

gnu: python-coverage: Update to 4.1.

* gnu/packages/python.scm (python-coverage): Update to 4.1.

gnu: eigensoft: Do not refer to "lapacke" output.

* gnu/packages/bioinformatics.scm (eigensoft)[inputs]: Remove reference
  to non-existing "lapacke" output.

gnu: lapack: Build the LAPACKE library.

* gnu/packages/maths.scm (lapack)[arguments]: Add "-DLAPACKE=ON".

gnu: Add emacs-solarized-theme.

* gnu/packages/emacs.scm (emacs-solarized-theme): New variable.

gnu: Add emacs-perspective.

* gnu/packages/emacs.scm (emacs-perspective): New variable.

gnu: Add emacs-tagedit.

* gnu/packages/emacs.scm (emacs-tagedit): New variable.

gnu: Add emacs-shell-switcher.

* gnu/packages/emacs.scm (emacs-shell-switcher): New variable.

gnu: Add emacs-undercover.

* gnu/packages/emacs.scm (emacs-undercover): New variable.

gnu: Add emacs-shut-up.

* gnu/packages/emacs.scm (emacs-shut-up): New variable.

gnu: Add emacs-smart-mode-line.

* gnu/packages/emacs.scm (emacs-smart-mode-line): New variable.