gnu: Add FLANN.
* gnu/packages/maths.scm (flann): New variable.
gnu: youtube-dl: Update to 2015.09.03.
* gnu/packages/video.scm (youtube-dl): Update to 2015.09.03.
gnu: Add libpano13.
* gnu/packages/photo.scm (libpano13): New variable.
Update copyright information in (gnu packages ruby).
gnu: Add ruby-ox.
* gnu/packages/ruby.scm (ruby-ox): New variable.
gnu: Add ruby-activesupport.
* gnu/packages/ruby.scm (ruby-activesupport): New variable.
gnu: Add ruby-json.
* gnu/packages/ruby.scm (ruby-json): New variable.
gnu: Add ruby-tzinfo.
* gnu/packages/ruby.scm (ruby-tzinfo): New variable.
gnu: Add ruby-thread-safe.
* gnu/packages/ruby.scm (ruby-thread-safe): New variable.
gnu: Add ruby-pry.
* gnu/packages/ruby.scm (ruby-pry): New variable.
gnu: Add ruby-slop-3.
* gnu/packages/ruby.scm (ruby-slop-3): New variable.
gnu: Add ruby-coderay.
* gnu/packages/ruby.scm (ruby-coderay): New variable.
gnu: Add ruby-method-source.
* gnu/packages/ruby.scm (ruby-method-source): New variable.
gnu: sound-theme-freedesktop: Specify the applicable licenses.
* gnu/packages/libcanberra.scm (sound-theme-freedesktop)[license]:
Specify the actual licenses that apply.
licenses: Add CC-BY-SA and CC-BY.
* guix/licenses.scm (cc-by-sa4.0, cc-by3.0): New variables.
gnu: Set license of the bootstrap tools.
* gnu/packages/bootstrap.scm (package-from-tarball)[license]: Set to
GPL3+.
* gnu/packages/make-bootstrap.scm (%static-binaries)[license]:
Likewise.
lint: Add 'license' checker.
* guix/scripts/lint.scm (check-license): New procedure.
(%checkers): Add 'license' checker.
* tests/lint.scm ("license: invalid license"): New test.
gnu: r-stringr: Provide valid 'home-page' URL.
* gnu/packages/statistics.scm (r-stringr)[home-page]: Set to valid URL.
emacs-build-system: Fix a file name of info directory.
* guix/build/emacs-build-system.scm (move-doc): Adjust to use
"/share/info" instead of its sub-directory.