gnu: Add guile-dbi.
* gnu/packages/guile.scm (guile-dbi): New variable.
gnu: screen: Update to 4.4.0.
* gnu/packages/screen.scm (screen): Update to 4.4.0.
gnu: Add emacs-lispy.
* gnu/packages/emacs.scm (emacs-lispy): New variable.
gnu: Add emacs-iedit.
* gnu/packages/emacs.scm (emacs-iedit): New variable.
gnu: Add emacs-ace-window.
* gnu/packages/emacs.scm (emacs-ace-window): New variable.
gnu: Add emacs-avy.
* gnu/packages/emacs.scm (emacs-avy): New variable.
gnu: Add emacs-ivy.
* gnu/packages/emacs.scm (emacs-ivy): New variable.
gnu: Add emacs-hydra.
* gnu/packages/emacs.scm (emacs-hydra): New variable.
gnu: Add emacs-org-bullets.
* gnu/packages/emacs.scm (emacs-org-bullets): New variable.
tests: Fix list of exports in (gnu tests).
* gnu/tests.scm: Export 'marionette-service-type'.
tests: Export 'run-basic-test'.
* gnu/tests/base.scm (run-basic-test): New procedure, extracted from ...
(%test-basic-os): ... here. Use it.
tests: Strengthen regexp in 'packages.scm'.
* tests/packages.scm ("--search-paths with pattern"): Call
'regexp-quote' on the result of 'derivation->output-path'.
gnu: guix: Add 'current-guix' thunk.
* gnu/packages/package-management.scm (source-file?)
(make-git-predicate, current-guix): New procedures.
utils: 'current-source-directory' gracefully handles lack of source info.
* guix/utils.scm (current-source-directory): Add case for when FILE-NAME
is #f.
utils: 'current-source-directory' resolves relative file names at run time.
* guix/utils.scm (absolute-dirname): New procedure.
(current-source-directory): Emit code to use it instead of calling
'search-path'.
store: 'register-path' no longer swallows 'system-error' exceptions.
* guix/store.scm (register-path): Do not catch 'system-error'.
services: Add 'gc-root-service-type'.
* gnu/services.scm (gc-roots->system-entry): New procedure.
(gc-root-service-type): New variable.
gnu: libxslt: Replace with 1.1.29 [fixes CVE-2016-{1683,1684}].
* gnu/packages/xml.scm (libxslt)[replacement]: New field.
(libxslt/fixed): New variable.
gnu: synthv1: Update to 0.7.5.
* gnu/packages/music.scm (synthv1): Update to 0.7.5.
gnu: Add lbzip2.
* gnu/packages/compression.scm (lbzip2): New variable.