* gnu/packages/mail.scm (dovecot): Add linux-pam to inputs, enabling the
  PAM auth driver.

* gnu/packages/sdl.scm (sdl-image)[propagated-inputs]: Add libwebp.

* gnu/packages/sdl.scm (sdl2-ttf): New variable.

* gnu/packages/sdl.scm (sdl2-mixer): New variable.

* gnu/packages/sdl.scm (propagated-inputs-with-sdl2): New procedure.
(sdl2-image): New variable.

* gnu/packages/samba.scm (samba): Update to 4.3.2.  Add more inputs.
[arguments]: Remove #:modules and #:imported-modules.  Remove 'chdir'
and 'add-lib-to-runpath' from #:phases.  Use 'modify-phases' syntax.

* gnu/packages/samba.scm (ldb): New variable.

* gnu/packages/samba.scm (tevent): New variable.

* gnu/packages/samba.scm (talloc): Update to 2.1.5.
[arguments]: Modify wscript to skip the 'magic_differs' test.

* gnu/packages/samba.scm (talloc)[arguments]: Use 'modify-phases' syntax.

* gnu/packages/password-utils.scm (libpwquality): New variable.

* gnu/packages/password-utils.scm (cracklib): New variable.

* gnu/packages/video.scm (obs): New variable.

* gnu/packages/patches/icecat-CVE-2015-7201-pt1.patch,
  gnu/packages/patches/icecat-CVE-2015-7201-pt2.patch,
  gnu/packages/patches/icecat-CVE-2015-7201-pt3.patch,
  gnu/packages/patches/icecat-CVE-2015-7205.patch,
  gnu/packages/patches/icecat-CVE-2015-7210.patch,
  gnu/packages/patches/icecat-CVE-2015-7212.patch,
  gnu/packages/patches/icecat-CVE-2015-7213-pt1.patch,
  gnu/packages/patches/icecat-CVE-2015-7213-pt2.patch,
  gnu/packages/patches/icecat-CVE-2015-7214.patch,
  gnu/packages/patches/icecat-CVE-2015-7222-pt1.patch,
  gnu/packages/patches/icecat-CVE-2015-7222-pt2.patch,
  gnu/packages/patches/icecat-CVE-2015-7222-pt3.patch: New files.
* gnu-system.am (dist_patch_DATA): Add them.
* gnu/packages/gnuzilla.scm (icecat)[source]: Add patches.

* gnu/packages/version-control.scm (subversion): Update to 1.8.15.

* gnu/packages/ruby.scm (ruby-unf-ext)[arguments]: Add phase "build-ext"
  to build "unf_ext.so".

* gnu/packages/admin.scm (cpulimit): New variable.

* gnu/packages/linux.scm (linux-libre): Update to 4.3.3.

Suggested by Florian Paul Schmidt.

* emacs/guix-backend.el (guix-default-port): Remove.
  (guix-repl-socket-file-name-function, guix-repl-current-socket): New
  variables.
  (guix-repl-socket-file-name, guix-repl-delete-socket-maybe): New
  procedures.
  (guix-get-guile-program): Take socket as an optional argument.
  (guix-start-repl-maybe): Adjust accordingly.

This is a followup to commit 8fb58371.

* emacs/guix-main.scm (graph-type-names): Use 'node-type-name'
  from (guix graph) module.

* gnu/packages/patches/python-ipython-inputhook-ctype.patch: New patch.
* gnu/packages/python.scm (python-ipython): Use it.
* gnu-system.am (dist_patch_DATA): Add it.

* gnu/packages/python.scm (python-click): Update to 6.2.
[source]: Change to pypi syntax.

* gnu/packages/python.scm (python-keyring): Update to 5.7.1.
[source]: Change to pypi syntax.
[native-inputs]: Add python-setuptools-scm.
[arguments]: Remove argument to replace unpack with unzip.

* gnu/packages/gnome.scm (gnome-session)[build-system]: Switch to
  GLIB-OR-GTK-BUILD-SYSTEM.
[inputs]: Add gsettings-desktop-schemas.

* gnu/packages/gnome.scm (clutter-gtk): Move clutter and gtk+ to 'propagated-inputs'.

* gnu/packages/databases.scm (tdb): Update to 1.3.8.
[source]: Switch to https URI.

* gnu/packages/video.scm (youtube-dl) [arguments]: Add
fix-the-data-directories phase.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>

Suggested by Leo Famulari <leo@famulari.name>.

* doc/guix.texi (package Reference): Explain 'propagated-inputs' for
non-C languages.

* gnu/packages/enlightenment.scm (enlightenment): Update to 0.20.1.

* gnu/packages/tmux.scm (tmux): Update to 2.1.

* guix/gexp.scm (<local-file>): Rename constructor to '%%local-file'.
Add 'absolute' field.
(%local-file, extract-directory, absolute-file-name): New procedures.
(current-source-directory): New macro.
(local-file): Adjust call to '%local-file'.
(local-file-absolute-file-name): New procedure.
(local-file-compiler): Force the 'absolute' field.
* tests/guix-system.sh: Test whether 'local-file' canonicalization
works.
* doc/guix.texi (G-Expressions): Adjust.

* guix/profiles.scm (info-dir-file)[build]: Pass --silent to
'install-info'.

* gnu/packages/ruby.scm (ruby-redcloth): New variable.

* gnu/packages/ruby.scm (ruby-sanitize): New variable.

* gnu/packages/ruby.scm (ruby-pygmentize): New variable.

* gnu/packages/ruby.scm (ruby-cutest): New variable.

* gnu/packages/ruby.scm (ruby-clap): New variable.

* gnu/packages/ruby.scm (ruby-nokogumbo): New variable.

* gnu/packages/web.scm (gumbo-parser): New variable.

* gnu/packages/ruby.scm (ruby-crass): New variable.