gnu: mutt: Update to 1.9.2.

* gnu/packages/mail.scm (mutt): Update to 1.9.2.

gnu: perl-test-yaml: Update to 1.06.

* gnu/packages/perl-check.scm (perl-test-yaml): Update to 1.06

gnu: perl-test-trap: Update to 0.3.3.

* gnu/packages/perl-check.scm (perl-test-trap): Update to 0.3.3.

gnu: perl-test-trailingspace: Update to 0.0301.

* gnu/packages/perl-check.scm (perl-test-trailingspace): Update to 0.0301

gnu: perl-test-simple: Update to 1.302120.

* gnu/packages/perl-check.scm (perl-test-simple): Update to 1.302120

gnu: perl-test-most: Update to 0.35.

* gnu/packages/perl-check.scm (perl-test-most): Update to 0.35

gnu: perl-net-dns: Update to 1.14.

* gnu/packages/networking.scm (perl-net-dns): Update to 1.14

gnu: perl-lingua-stem-ru: Update to 0.04.

* gnu/packages/language.scm (perl-lingua-stem-ru): Update to 0.04
[source]: Update download URI.

gnu: perl-lingua-en-inflect: Update to 1.903.

* gnu/packages/language.scm (perl-lingua-en-inflect): Update to 1.903

gnu: perl-crypt-openssl-bignum: Update to 0.09.

* gnu/packages/tls.scm (perl-crypt-openssl-bignum): Update to 0.09

gnu: perl-compress-raw-zlib: Update to 2.076.

* gnu/packages/compression.scm (perl-compress-raw-zlib): Update to 2.076

gnu: gflags: Update to 2.2.1.

* gnu/packages/popt.scm (gflags): Update to 2.2.1

gnu: linux-libre: Update to 4.14.6.

* gnu/packages/linux.scm (%linux-libre-version): Update to 4.14.6.
(%linux-libre-hash): Update hash.

gnu: linux-libre@4.9: Update to 4.9.69.

* gnu/packages/linux.scm (linux-libre-4.9): Update to 4.9.69.

gnu: linux-libre@4.1: Update to 4.1.48.

* gnu/packages/linux.scm (linux-libre-4.1): Update to 4.1.48.

gnu: hplip: Update to 3.7.11.

* gnu/packages/cups.scm (hplip): Update to 3.7.11.
[source]: Add 'snippet'.
[arguments]: In 'fix-hard-coded-file-names' phase, adjust hack for
$(hplip_statedir) creation.
[inputs]: Add ZLIB.
[native-inputs]: Add PERL.

gnu: guile-gdbm-ffi: Default to Guile 2.2.

* gnu/packages/guile.scm (guile-gdbm-ffi)[inputs]: Switch to GUILE-2.2.
(guile2.0-gdbm-ffi, guile2.2-gdbm-ffi): New variables.

etc: Add snippets.

* etc/snippets/scheme-mode/guix-cvs-reference,
etc/snippets/scheme-mode/guix-git-reference,
etc/snippets/scheme-mode/guix-hg-reference,
etc/snippets/scheme-mode/guix-origin,
etc/snippets/scheme-mode/guix-package,
etc/snippets/scheme-mode/guix-svn-reference,
etc/snippets/text-mode/guix-commit-message-add-package,
etc/snippets/text-mode/guix-commit-message-update-package: New files.
* doc/contributing.texi (The Perfect Setup): Document snippets.

gnu: texlive-bin: Disable tests on aarch64.

* gnu/packages/tex.scm (texlive-bin)[arguments]: Disable tests on aarch64.

gnu: ceres-solver: Update to 1.13.0.

* gnu/packages/maths.scm (ceres-solver): Update to 1.13.0.