gnu: Add ocaml-ppx-variants-conv.

* gnu/packages/ocaml.scm (ocaml-ppx-variants-conv): New variable.

gnu: Add ocaml-ppx-sexp-conv.

* gnu/packages/ocaml.scm (ocaml-ppx-sexp-conv): New variable.

gnu: Add ocaml-variantslib.

* gnu/packages/ocaml.scm (ocaml-variantslib): New variable.

gnu: Add ocaml-typerep.

* gnu/packages/ocaml.scm (ocaml-typerep): New variable.

gnu: Add ocaml-sexplib.

* gnu/packages/ocaml.scm (ocaml-sexplib): New variable.

gnu: asciidoc: Add XML and XSLT support.

* gnu/packages/documentation.scm (asciidoc)[arguments]: Add
set-xml-binary-paths phase.
[inputs]: Add libxml2 and libxslt.

pack: Add '--symlink'.

* guix/scripts/pack.scm (self-contained-tarball): Add #:symlinks
parameter.
[build](symlink->directives): New procedure
(directives): New variable.
Add call to 'evaluate-populate-directive'.  Pass the directories among
DIRECTIVES to 'tar'.
(%default-options): Add 'symlinks'.
(%options, show-help): Add '--symlink'.
(guix-pack): Honor it.
* gnu/build/install.scm (evaluate-populate-directive): Export.
* doc/guix.texi (Invoking guix pack): Document it.

nls: Mark (guix scripts pack) as translatable.

* po/guix/POTFILES.in: Add 'guix/scripts/pack.scm'.

pack: Add '--localstatedir' option.

* guix/scripts/pack.scm (self-contained-tarball): Add #:localstatedir?
parameter and honor it.
(%options, show-help): Add '--localstatedir'.
(guix-pack): Honor it.
* gnu/build/install.scm (populate-single-profile-directory): Add
 #:register? parameter and honor it.
* doc/guix.texi (Binary Installation): Use '--localstatedir' in
example.
(Invoking guix pack): Document it.

gnu: linux-libre@4.1: Update to 4.1.39.

* gnu/packages/linux.scm (linux-libre-4.1): Update to 4.1.39.

gnu: windowmaker: Use modify-phases syntax.

* gnu/packages/gnustep.scm (windowmaker)[arguments]: Use modify-phases.

gnu: windowmaker: Update to 0.95.8.

* gnu/packages/gnustep.scm (windowmaker): Update to 0.95.8.

gnu: aria2: Update to 1.31.0.

* gnu/packages/bittorrent.scm (aria2): Update to 1.31.0.

upstream: Avoid '_' as a pattern variable in 'match'.

* guix/upstream.scm (lookup-updater): Don't use '_' as a pattern
variable.

gnu: python-parsedatetime: Update to 2.3.

Version 2.1 was apparently time-sensitive and started failing like this:

  ======================================================================
  FAIL: testFloat (tests.TestDelta.test)
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "/tmp/guix-build-python2-parsedatetime-2.1.drv-0/parsedatetime-2.1/tests/TestDelta.py", line 64, in testFloat
      self.cal.parse('1.4 months ago', self.source), months=-1.4)
    File "/tmp/guix-build-python2-parsedatetime-2.1.drv-0/parsedatetime-2.1/tests/TestDelta.py", line 37, in assertDelta
      self.assertTrue(diff < 0.05, '%s is not less than 0.05' % diff)
  AssertionError: 0.0666666666667 is not less than 0.05

  ----------------------------------------------------------------------

* gnu/packages/python.scm (python-parsedatetime): Update to 2.3.
[native-inputs]: Add PYTHON-PYTEST and PYTHON-PYTEST-RUNNER.
[propagated-inputs]: New field.

gnu: Add dovecot-libsodium-plugin.

* gnu/packages/mail.scm (dovecot-libsodium-plugin): New variable.

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

gnu: Add dovecot-trees.

* gnu/packages/mail.scm (dovecot-trees): New variable.

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

build: On 2.2, build package files with almost no optimizations.

* build-aux/compile-all.scm (%default-optimizations)
(%lightweight-optimizations): New variables.
(optimization-options): New procedure.
(compile-file*): Use it.

gnu: wireless-regdb: Update to 2017.03.07.

* gnu/packages/linux.scm (wireless-regdb): Update to 2017.03.07.

gnu: guile-cairo: Honor the Guile effective version.

* gnu/packages/gtk.scm (guile-cairo)[arguments]: Add #:modules.
Get the effective version of Guile and use that in installation
directory names.