gnu: Add dblatex.

* gnu/packages/docbook.scm (dblatex): New variable.

gnu: guile-ncurses: Update to 1.5.

* gnu/packages/guile.scm (guile-ncurses): Update to 1.5.  Remove patch.
* gnu/packages/patches/guile-ncurses-tests.patch: Remove.
* gnu-system.am (dist_patch_DATA): Remove it.

packages: Optimize 'find-packages-by-name' to avoid disk accesses.

On a profile with 182 entries, "guix package --search-paths" goes from
4.5 seconds down to 0.4 second.

* gnu/packages.scm (find-packages-by-name): Make a name -> package vhash
  in a promise; access it with 'vhash-fold*'.

gnu: bash: Update to 4.3.27 and fix out-of-bounds memory accesses.

Based on a patch by Ludovic Courtès <ludo@gnu.org>.

* gnu/packages/bash.scm (%patch-series-4.3): Add two patches.
  (bash)[source]: Add parser-oob patch.  Add 'snippet'.
  [native-inputs]: New field.
* gnu/packages/commencement.scm (bison-boot1): New variable.
  (static-bash-for-glibc): Add 'native-inputs'.

Co-Authored-By: Ludovic Courtès <ludo@gnu.org>

gnu: Add synergy.

* gnu/packages/synergy.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

gnu: duplicity: Fix and disable some tests.

* gnu/packages/patches/duplicity-piped-password.patch: New patch.
* gnu/packages/patches/duplicity-test_selection-tmp.patch: New patch.
* gnu-system.am (dist_patch_DATA): Add them.
* gnu/packages/backup.scm (duplicity)[source]: Add patches field.
  [inputs]: Add util-linux and tzdata.
  [arguments]: rename patch-tests phase to check-setup.  Set HOME and TZDIR
  for tests.

gnu: Add dionysus.

* gnu/packages/maths.scm (dionysus): New variable.

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

gnu: Add ruby-i18n.

* gnu/packages/ruby.scm (ruby-i18n): New variable.

gnu: Add ruby.

Co-authored-by: David Thompson <davet@gnu.org>

* gnu/packages/ruby.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* guix/licenses.scm (ruby): New variable.

gnu: hurd-headers: Use --build instead of --host.

* gnu/packages/hurd.scm (hurd-headers): Replace '--host' with
  '--build'.

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

gnu: qt-4: Explicitly link with icu.

* gnu/packages/qt.scm (qt-4): Explicitly link with libicui18n, which is
    dlopened by QtCore.so.

gnu: Add Nix.

This commit is dedicated to the Nix project, without which we wouldn't
be hacking all this today.  :-)

* gnu/packages/package-management.scm (nix): New variable.

gnu: Add perl-www-curl.

* gnu/packages/web.scm (perl-www-curl): New variable.

gnu: Add perl-dbi and perl-dbd-sqlite.

* gnu/packages/databases.scm (perl-dbi, perl-dbd-sqlite): New variable.

gnu: mit-scheme: Rename top-level helper.

Suggested by Mark H. Weaver.

* gnu/packages/scheme.scm (source-directory): Rename to...
  (mit-scheme-source-directory): ... this.

gnu: Add graphite2.

* gnu/packages/fontutils.scm (graphite2): New variable.

gnu: mit-scheme: Delete more dangling symlinks for non-x86 systems.

* gnu/packages/scheme.scm (mit-scheme): Delete more dangling symlinks for
    non-x86 systems.

gnu: mit-scheme: Fix source file name for mips64el.

* gnu/packages/scheme.scm (mit-scheme): Fix source file name for
     architectures other than x86_64 and i686.

gnu: phonon: Update to 4.8.0.

* gnu/packages/kde.scm (phonon): Update to 4.8.0.

gnu: mit-scheme: Update to 9.2.

* gnu/packages/scheme.scm (mit-scheme): Update to 9.2.